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Board of Governors of the Federal Reserve System

International Finance Discussion Papers

Number 1106, June 2014 --- Screen Reader
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NOTE: International Finance Discussion Papers are preliminary materials circulated to stimulate discussion and critical comment. References in publications to International Finance Discussion Papers (other than an acknowledgment that the writer has had access to unpublished material) should be cleared with the author or authors. Recent IFDPs are available on the Web at http://www.federalreserve.gov/pubs/ifdp/. This paper can be downloaded without charge from the Social Science Research Network electronic library at http://www.ssrn.com/.

Abstract:

We develop a theory that focuses on the general equilibrium and long-run macroeconomic consequences of trends in job utility. Given secular increases in job utility, work hours per capita can remain approximately constant over time even if the income effect of higher wages on labor supply exceeds the substitution effect. In addition, secular improvements in job utility can be substantial relative to welfare gains from ordinary technological progress. These two implications are connected by an equation flowing from optimal hours choices: improvements in job utility that have a significant effect on labor supply tend to have large welfare effects.

Keywords: Labor supply, work hours, drudgery, income effect, substitution effect, job utility

JEL classification: E24, J22, O40

In his 1930 essay, "Economic Possibilities for Our
Grandchildren," Keynes predicted that a large increase in leisure
would take place over the following century, but robust signs of
such a leisure boom have failed to materialize. As shown in Figure
(1), for a large set of OECD countries, from 1956 through 2009
aggregate (real) consumption per working-age population (ages
15-64) rose by 100% and more, while work hours per working-age
population have been dramatically flat in comparison.^{4}

It is not unreasonable to think, as Keynes did, that the extent
to which consumption has increased, along with long-run growth in
real wages, should have led to a prominent trend decline in work
hours driven by the income effect overtaking the substitution
effect. Indeed, there is good reason to think that income effects
are substantial (see, for instance, Kimball and Shapiro 2008). Why
are people still working so hard? And, what are the welfare effects
of this *paradox of hard work*?

Figure 1: Work Hours Per Population (Left) and Private Consumption per Population (Right)

In principle there are four alternative, but not mutually exclusive, explanations through which the paradox of hard work can be rationalized (detailed just below). Of the set of explanations for the paradox of hard work, in this paper we focus on job utility. Economists have long understood that cross-sectional differences in job utility at a particular time give rise to compensating differentials. We develop a theory that focuses on a less-studied topic: understanding the long-run macroeconomic consequences of trends in job utility.

The four rationalizations of the paradox of hard work are as follows.

- Assuming that the elasticity of intertemporal substitution is
large. However, empirical evidence suggests the contrary. Hall
(1988) finds this elasticity to be approximately zero, Basu and
Kimball (2002) find that plausible values are less than 0.7, and
Kimball, Sahm, and Shapiro (2011) find a value of approximately
0.08.
^{5} - An increasing ratio of effective marginal wages to consumption.
This could be the result, for instance, of a reduction in the
progressivity of the tax system, an intensification of competition
for promotions within firms, and increasing educational
debts.
^{6} - Anything that keeps the marginal utility of consumption high.
This could be, for example, because of habit formation, whether
internal and external ("keeping up with the Joneses"), and from the
introduction of new goods.
^{7} - Anything that serves to keep the marginal disutility of work
low. This can be, for instance, the result of technological
progress in household production, non-separability between
consumption and leisure (King, Plosser, and Rebelo (1988), Basu and
Kimball (2002)), and jobs getting nicer.
^{8}

We propose an intertemporal framework for thinking about the causes and effects of secular increases in job utility, that is, of jobs getting nicer. Some of the questions that our framework provides answers to are the following.

- How do (on-the-job) effort, amenities, job-enjoyment technology, and labor-augmenting technology interact?
- What are the key determinants of long-run labor supply given job utility?
- How does job utility matter for firms' optimization problems and firms' ongoing ability to operate, attract workers, and establish job parameters given long-run changes in labor-augmenting technology and job-enjoyment technology?
- What are the long-run welfare effects of changes in job utility?

In turn, the answers to these questions lead to two
contributions to the macro and labor economics literatures. First,
we show that secular improvements in job utility--*the decline of
drudgery*--can induce work hours to remain approximately
constant over time even if the income effect of higher wages on
labor supply exceeds the substitution effect of higher wages.
Therefore, the paradox of hard work is not necessarily evidence
that the elasticity of intertemporal substitution is large, that
preferences are strongly non-separable, or that preferences have
some other feature such as habit formation. Second, we show that
secular improvements in job utility can be very substantial in
comparison to the welfare gains from ordinary (say,
labor-augmenting) technological progress. These two implications
are connected by an equation: improvements in job utility that have
a significant effect on labor supply tend to have large welfare
effects.

This paper proceeds as follows. Section 2 relates our work to the static theory of compensating differentials. Section 3 provides a general overview of our framework. Then, Section 4 discusses the variables we focus on and how our formulation maps into the real world. Sections 5 and 6 focus, respectively, on the optimization problems of individuals and firms. Section 7 deals with the economy's general equilibrium. Then, Section 8 addresses the welfare consequence of changes in job utility. Finally, section 9 concludes.

The natural point of reference for our analysis is the theory of compensating differentials, spelled out originally in the first ten chapters of Book I of "The Wealth of Nations" (Smith, 1776). A standard modern reference on compensating differentials is Rosen (1986).

The solid line in the left panel of Figure 2 is a wage/job-utility frontier: jobs offering lower job utility will, in principle, compensate by offering higher real wages (in the figure is the real wage and is job utility). Thus, all else equal, individuals face a trade-off between these two variables. Conditional on individual preferences, a particular worker optimizes by choosing a feasible point on the (solid) frontier in the plane.

The solid line in the right panel of Figure 2 is a job-utility/output frontier: in order to improve job utility firms must divert part of their resources away from the production of output (). Given its idiosyncratic costs of job utility in terms of output, a particular firm optimizes by choosing a feasible point on the (solid) frontier in the plane.

Figure 2. Theory of Compensating Differentials. Left panel: real wage () / job utility () frontier faced by workers. Right panel: job utility / output () frontier faced by firms.

Suppose higher output and higher real wages came from movements
*along* the solid frontiers ( to
in the left panel and
to in the right panel). As argued in Kimball
and Shapiro (2008), income effects on labor supply are substantial.
So, the higher real wage implied by moving from point to point would tend to reduce work hours. In
addition, if work hours are increasing in job utility, then lower
job utility implied by moving from point to point
also puts downward pressure on work
hours.

However, the frontiers themselves can shift (the dashed lines in
Figure 2). As the economy's choice set expands, optimal choices can
entail moving to points such as
and
, in which case job utility,
output, and real wages all rise, and increases in job utility
emerge as potentially *offsetting* to income effects.

The theory we develop in this paper focuses attention on understanding the dynamic general equilibrium implications and endogenous foundations of such intertemporal changes in the economy's choice set. This understanding is complementary to the long-standing static, partial equilibrium microeconomic framework of compensating differentials.

There are no distortions in our model so the planning version of the economy is equivalent to a decentralized economy with perfect competition. Both perspectives are valuable, and we begin with the social planning perspective.

Consider individuals who obtain utility from consumption and non-work time. A standard assumption is that any time devoted to work always subtracts from utility. Our alternative assumption is that process benefits and process costs of work--what we call "job utility" --matter as well.

The problem that an idealized social planner would face helps summarize our overall framework. The social planner's problem involves choosing consumption, capital, work hours devoted to particular jobs, effort demands by a particular job (per hour of work), and amenities provided by a particular job in order to maximize a household's lifetime utility given firms' production structures and other standard constraints.

We consider a small open economy in which agents can freely borrow and lend at the exogenously determined real interest rate (equal to , the rate at which all economic agents discount the future). Capital is freely mobile across firms and boarders. We assume that all benefits and costs to firms and workers other than the utility from leisure and consumption are proportional to work hours. These assumptions jointly guarantee that there will never be any disagreement between workers and firms about job parameters other than the wage. Furthermore, given fully mobile capital and the exogenous world interest rate, we can focus on steady state analysis since the absence of state variables implies that changes between steady states occur instantaneously. The model is cast in continuous time (we omit time indexes in order to avoid notational clutter).

The economy is inhabited by ,..., firms all of which are producers of the same final good and a continuum of individuals whose mass is normalized to one. Households each have only one individual, so we will use the terms household and worker interchangeably.

Utility depends on consumption, the division of time into work
time and non-work time, and job utility per hour of work. Job
utility depends on effort, amenities, and *job-enjoyment
technology* (we elaborate on all of these further below).

Firms produce output using capital and *effective labor
input* (the product of hours, effort and labor-augmenting
technology), and can vary in their real wage and job utility
offerings.

Table 1 below lays out our notation. In that notation, the planning problem is:

,

and
.

For any variable , refers to its change over time.

Table 1: Variables adn Parameters

Variable/Parameter | Description |
---|---|

Variable: U | Instantaneous utility |

Variable: J | Job utility function |

Variable: t | Denotes time |

Variable: C | Total consumption of final output |

Variable: H | Total work hours |

Variable: H_{i} | Work hours devoted to ith firm |

Variable: E_{i} | ith firm effort demands |

Variable: A_{i} | ith firm amenities provision |

Variable: Y_{i} | ith firm final output |

Variable: K_{i} | ith firm capital use |

Variable: Z_{i} | ith firm labor-augmenting technology |

Parameter: ρ | Discount rate |

Parameter: T | Time endowment |

Parameter: Ψ_{i} | Job-enjoyment technology |

Parameter: Π | Non-labor, non-interest income |

Parameter: δ | Depreciation rate |

Our objective is to deal with many real world features of jobs without adding too much to the complexity of our model. So, we have a broad interpretation of consumption, work hours, effort, amenities, and job utility that allows each to address multiple dimensions of the real world. For example, job-enjoyment technology is meant to capture both innovations in the nature of work proper and innovations in the nature of the work environment.

Consumption, , is meant to capture all the richness of how resources other than time affect life outside of working hours. For instance, a broad notion of consumption necessarily accounts for fringe benefits.

Work hours, , is meant to capture every way in which a person's job interferes with the quantity and enjoyment of non-work time and home production. For example, if an individual is unable to stop thinking about work issues while at home and this interferes with other activities at home, then that can be considered an effective reduction in leisure and hence an increase in . Also, consider time spent away from home due to work-related travel. Travel may boost the utility of non-work time if it provides pleasant and interesting experiences. However, work-related travel can also hamper the enjoyment of non-work time because of being away from friends and family. In either case, an adjustment to may be warranted.

Effort, , is meant to capture all aspects of a job that generate proportionate changes in effective productive input from labor. Effort has many dimensions. For example, the intensity of a worker's concentration on a task while at his or her work station, the amount of time spent at the water cooler or in other forms of on-the-job leisure, own time spent cleaning and beautifying the work place, time spent in office parties or morale building exercises during work hours, and amount of time spent pursuing worker interests that have some productivity to the firm but would not be the boss's first priority, are all dimensions of effort.

Amenities, , are job characteristics whose cost to
the firm is in terms of goods. The real-world characterization of
amenities is just as rich as the characterization of effort. For
instance, amenities include the number of parking spots, the
quality of air conditioning, and the quality and capacity relative
to the number of employees of the office gym.^{9}

Job-enjoyment technology affects the mapping of effort and amenities into overall job utility. Therefore, changes in this technological component can be interpreted as capturing innovations in the nature of work proper, or innovations related to the work environment.

**Innovations in the Nature of Work Proper** Innovations in the nature of work proper come in many forms. For
example, working in groups, establishing clear guidelines about
what is expected from the worker, allowing workers to have greater
discretion in the way projects are carried out, developing creative
ways to give workers feedback on their performance (including
constructive criticism techniques rather than, say, yelling at the
worker about what he or she is doing wrong), improving the
organizational structure of the firm in terms of who does what, how
they do it and when they do it, and allowing individuals greater
flexibility in determining the time during which work is carried
out all count historically as innovations in the nature of work
proper.

**Innovations in the Nature of the External Work Environment** Innovations related to the external work environment come in
many forms as well. In particular, think of the advent of air
conditioning, the distribution, design, and allocation of physical
work space (such as cubicalization or open office environments),
the provision of on-site childcare, exercise, and laundry
facilities, and the institution of measures to reduce the incidence
of sexual harassment.

The job utility function itself is the optimum over many possible ways of doing things. For example, consider two production techniques, as shown in Figure 3 in space. Production technique 1, yielding , results in relatively higher job utility at lower levels of effort, while production technique 2, yielding , results in relatively higher job utility at higher levels of effort. Then, is the upper envelope (bold) of these two techniques. The analytical framework that we develop is robust to such non-concavities in job-utility functions.

Figure 3: The Job-Utility Function, , as the Upper Envelope of the Two Different Production Techniques and

The function maps , , and into the hourly utility associated with being at work. is a vector describing all dimensions of what the average hour of work is like that affects productivity (aspects of effort, including the fraction of time spent in each different activity at work). is the amenities counterpart to this. Recall that is job-utility technology. and are determined optimally by firms.

The reduced form job utility function comes from maximizing over these vectors, subject to keeping effort-related productivity and the cost of amenities the same, that is,

s.t.

,

,

where
is a vector of real
amenity prices. So, the number --hourly effort
per worker--gives effective productive input from an hour of labor
before multiplication by labor-augmenting technology, while the
number summarizes the expenditure on amenities
per hour of work.^{10}

We allow for to be either positive or
negative and we allow for the possibility that job utility is
increasing in effort at relatively small levels of effort, but we
assume it must be decreasing in effort at relatively high levels of
effort if only because physical and mental exhaustion eventually
push toward
(otherwise there would be no upper limit to feasible ).^{11} We also assume that
and
.

We now focus on the decentralized version of the representative worker's optimization problem. We show that this problem can be broken into three optimization subproblems that jointly answer the following question: Once job utility is accounted for, what are the key determinants of labor supply?

Given financial wealth and job opportunities, the worker chooses consumption , total work hours , work hours devoted to each job , to maximize utility

s.t.

, | (1) |

,

and

.

Overall flow utility comes from consumption utility , utility from off-the-job leisure , is the real wage offered by the th job, which the worker takes as given. We assume that , , , and . The choice of job is represented simply as the choice of whether to devote strictly positive work hours to any one job in particular. Here, we assume that utility is additively separable between consumption and all the dimensions of labor. (A companion paper relaxes that assumption, and yields broadly similar results as those we obtain in the present paper).

The current-value Hamiltonian associated with the worker's problem is

. |

This maximization problem can be broken down into four optimization subproblems:

. |

Above, is the costate variable giving the
marginal value of real wealth; the Euler equation is
.
is the multiplier on the work-hours constraint. is the multiplier on the nonnegativity constraint for
hours at each possible job.^{12} Finally, denotes
the *marginal hourly net job benefits* associated with a job
of type . The four optimization subproblems nested
within maximization of the current-value Hamiltonian are:(1) the
consumption decision; (2) job choice; (3) the decision about work
hours for each job; and (4) the overall hours decision.

In the additively separable case here we normalize and so that
.^{13}
Given this normalization, means
that a worker would be willing to spend at least some time on a job
even if unpaid, should that be the only job available. On the other
hand, means that a worker would never
do such a job unless paid.

**Choice of Consumption** As shown in the left panel of Figure 4, the solution to the
first optimization sub-problem,
, is to choose consumption to satisfy the first order condition
.

Figure 4: Household Solution to Choice of Consumption, , and Total Work Hours,

**Choice of Jobs and Hours at Each
Job** Job choice involves surveying all possible job types and
choosing the job or jobs with the highest . At
an optimum
. It follows that if total work hours are spread across
more than one job type it must be the case that each job with
positive hours for the individual is offering the same level of
(hourly marginal net) job benefits--although they need not be
offering the same combination of real wage and job utility.
Formally, the level of hourly net job benefits for all jobs with
strictly positive hours is
. We elaborate on
the fraction of time devoted to each job later.

**Choice of Overall Work Hours** Combining the job choice with the choice of work hours at each
job, optimization requires if
and
when . This implies that : the
marginal benefit of overall work hours is equal to the marginal
benefit of hours at the job with the highest job benefits.
Therefore, total work hours should be chosen to satisfy
. In words, at the optimal
level of work hours, the marginal utility from off-the-job leisure
is equal to job benefits of the most attractive job.
Thus, the right panel of Figure 4 shows the determination of the
optimal choice of . Note that the
*labor-hours supply function* is
, and the equivalent to a
market clearing price for work hours is job benefits . (We postpone discussion of the determination of the
general equilibrium value of to Section
7.).

Three questions follow immediately. First, how do long-run changes in work hours depend on job utility? Second, assuming there is more than one viable employment opportunity available (that is, assuming more than one firm is able to offer the highest job benefits), how does the worker decide to allocate work hours between jobs? Third, how do short-run changes in work hours depend on job utility?

Kimball and Shapiro (2008) argue that income effects on labor supply are likely to be substantial. They then look at what that would imply for the Frisch (marginal value of wealth held constant )labor supply elasticity if income and substitution effects on labor supply cancel out. But, our framework allows for work hours to remain relatively constant even if the income effect dominates the substitution effect. Consider the effects when consumption and real wages rise.

Recall that , and that as shown in the right panel of Figure 4, work hours are increasing in . If the income effect dominates the substitution effect, then is decreasing ( is growing, but is declining in line with increases in consumption), which. All else equal that makes --and therefore work hours--decrease as well.

But if job utility, , is rising sufficiently, then the income effect can be counterbalanced by the increase in along with the increase in that blunts the fall of in .

There is another surprising implication. Even if because the income effect overwhelms the substitution effect (that is, because more quickly than ), work hours will tend to some constant as long as job utility tends to some constant . That is, even if people face quickly declining marginal utility for additional consumption, a positive asymptote for work hours can exist if there are jobs people enjoy as much as the marginal non-work activity they would otherwise fill out their days with.

If two jobs have both the same wages and the same job utility, the division of time between them can only be pinned down by general equilibrium forces. But, when two jobs have the same net job benefits but different combinations of wages and job utility, the endogenous determination of can lead to a determinate interior optimum based on worker optimization alone. Suppose with and . That is, job 1 is higher paid than but job 2 is more pleasant. Let be the fraction of total work hours that the worker devotes to working for firm . At an interior optimum for a worker

,

so .Given the labor-hours supply function, the optimal level of work hours satisfies . Substituting into the worker's budget constraint implies that

,

which after rearrangement yields

It follows that for any given marginal value of wealth and job benefits, higher exogenous wealth is associated with greater work hours being devoted to jobs with higher job utility and lower wages. Alternatively, at any given set of wages and equilibrium job benefits, the higher is the more work hours are devoted to jobs with the highest wages.

Also, note that in the event that more than two jobs have the same net job benefits, any but the extreme of these set of jobs-the one with the highest wage and lowest job utility and the one with the lowest wage and highest job utility-is equivalent from the worker's perspective to a convex combination of time devoted to the extreme jobs. So, in the absence of fixed costs of going to work the analysis for jobs is essentially the same as for two jobs. (If there are fixed small costs per job, the worker might slightly prefer an in-between job and would never choose three jobs).

At any given level of job benefits , having a more pleasant, lower-paying job will result in a lower (Frisch) labor supply elasticity. To see this, rewrite as , where is the fraction of the wage that is a compensating differential. Defining the elasticity of work hours with respect to by , then so that holding everything constant except wages . So, with and held constant,

is the Frisch elasticity of labor supply. Thus, the higher job utility is, the lower is labor supply elasticity with respect to temporary changes in the real wage.

The results about multiple jobs in Section 5.2.2 suggested that as economies become richer, workers are likely to switch to jobs with higher job utility. Therefore, if as determined by the curvature of stays relatively constant as an economy gets richer, the volatility of work hours will fall relative to the volatility of temporary changes in the real wage. Cross-sectionally, and more speculatively, workers employed in jobs that they "hate" should have a higher Frisch labor supply elasticity if the relevant curvature of is similar across workers in these different jobs.

In the decentralized version of the optimization problem for
firms, the firms are price takers in the product market. Each
firm's production function takes as inputs capital and effective
labor input (the product of hours, effort, and labor-augmenting
technology). The firm rents capital at an exogenous rental rate
(determined by the international real interest rate). The hourly
cost of labor is captured by the *inclusive wage*: the sum of
the real wage and the hourly cost of amenities. The solution to the
firm's cost minimization problem implies that its cost function can
be stated as a function of the rental rate of capital and the
*effective wage:* the ratio of the inclusive wage to
*effective* labor productivity (the product of effort and
labor-augmenting technology). Minimization of the effective wage is
the focus of the firm's optimization subproblems.

Consider a representative providing a job with job-enjoyment technology . The firm's production function is , where capital's share and other variables are as defined earlier. Let denote the rental rate of capital, which is exogenous to the firm. (There are no adjustment costs, so ).

For any output level
a firm's cost minimization
problem involves choosing capital , and
total work hours , to minimize total cost
subject to
.
is the *inclusive
wage*:

.

That is, in payment for their labor, workers receive the real wage (which includes fringe benefits), and as indirect payment--through job utility--amenities .

The solution to the firm's costs minimization problem is
standard. The firm's total cost is a function of the desired level
of output, , the rental rate of capital,
, and the *effective wage*,
. The effective wage
is equal to the inclusive wage
per labor effectiveness:
. Thus,
the firm's cost function is

. | (2) |

The rental rate of capital is exogenous, but the effective wage is a function of the real wage, effort, and amenities, all of which are choice variables: How should the firm analyze its decision? First, unless the firm is going to shut down, the firm must choose the effective wage so that the firm offers are at least as high as equilibrium job benefits. Then, two nested subproblems follow. The first subproblem involves the choice of amenities. Then, given the optimal choice of amenities, the firm faces a decision about the real wage and effort. The solution to both of these nested subproblems can be summarized in terms of tangency conditions.

Given equation (2) , any operating firm should minimize its effective wage subject to its constraints:

s.t.

In solving this optimization subproblem firms take the marginal value of wealth , the rental rate of capital , and equilibrium job benefits , as given. However, both the real wage , and amenities , are choice variables. We will assume additive separability in job utility between effort and amenities:

, | (3) |

where captures innovations in the nature of work proper and captures innovations in the nature of the work environment. We will write .

By the definitions of the inclusive and effective wages

so . Substituting this last equation into the firm's problem of meeting the market level of so it can attract workers (which must bind at the optimal solution) it follows that

This implies the nested subproblem:

Thus, the choice of amenities should satisfy the tangency condition . This optimality condition is shown graphically in space in the left panel of Figure 5.

Figure 5: Solution to a Representative Firm's Optimization Subproblems

It is helpful to define

the individual surplus received from the firm's optimal choice of amenities. Note that by the envelope theorem. Thus, the lower the marginal value of wealth (intuitively, the richer a worker is), the greater the surplus from amenities.

Given the optimal choice of amenities, the firm's problem of minimizing the effective wage reduces to a second nested subproblem:

s.t.

, | (4) |

where is the net job utility function (net of the costs of amenity provision measured in utils). Rearranging,

(5) |

and the objective is to find a feasible value of corresponding to the lowest . In space the left-hand side of equation (5) traces out all effort and job-utility combinations that are consistent with any given effective wage: the firm's isocost lines shown as downward sloping lines in the right panel of Figure 5. In that same panel the job utility function is shown as a concave curve. The firm's objective is to find the tangency that yields an isocost line with the intercept at and minimum downward (absolute value) slope that touches the job utility curve.

In other words, given , the solution to the firm's optimization subproblem is implicitly captured by the isocost line that has the flattest (algebraically greatest) feasible slope. Feasibility is determined by the firm's net job utility function, which captures all net job utility and effort combinations that a firm is able to offer. As seen in the right panel of Figure 5, and is the firm's optimal effective wage: it can do better than , and although is preferred to , the former is not feasible given the firm's net job utility function.

Given and , once the optimal and are pinned down, it is straightforward to back out the optimal using the definition of the effective wage and the value of given the definition of net job utility.

Despite the fact that job utility can be increasing in effort for some part of the range, the tangency condition shown in the right panel of Figure 5 implies that effort will be unpleasant at the optimum. Indeed, at the optimum:

Then, and imply that for positive wages (and nonnegative amenities), at the optimal choice of effort . That is, the optimal choice of effort occurs where job utility is decreasing in effort.

In other words, since effort is productive it would make no sense to limit effort when additional effort is also pleasant. Effort should be increased until additional effort is painful enough that it counterbalances the extra productivity.

The next question is: How are equilibrium job benefits and the marginal value of wealth determined?

From any firm's point of view the firm-specific effective wage, , must equal the prevailing market value of for the firm to have positive output. Perfect competition in the product market implies that, in equilibrium, each firm's marginal cost is equal to the price of final output--which is normalized to 1. Given the cost function in equation that means firms with positive output must have

which implies

Figure 6 extends the intuition from Figure 5 to this case in which, as far as a representative firm is concerned, the slope of an isocost line is exogenously determined. Because cost minimization must hold, optimality continues to require being at a point of tangency between the net job utility function and an isocost line. Amenities are determined as earlier.

Given the values of , , and , the firm faces, the left panel of Figure 6 shows optimal effort requirements, , and net job utility, . These determine the optimal real wage , and job utility .

Figure 6: Determination of Total Work Hours Under Perfect Competition

The intersection of the firm's isocost line with the horizontal axis now determines equilibrium job benefits . Given this equilibrium level of , the right panel of Figure 6 shows the determination of total work hours, . This logic can be expressed by the functions and . Note that the firm that is able to offer the highest job benefits is the firm that implicitly sets the economy's equilibrium level of job benefits.

In general equilibrium, our open-economy framework has , and , where is the fraction of total work hours that the individual devotes to firm . (Thus, .). Let denote the wage averaged across jobs. Given the individual's first-order condition for consumption, a labor-earnings demand function () can be defined as follows:

. | (6) |

Since , a labor-earnings supply function () can be defined in this way:

, | (7) |

where once again we have made use of the definition of the average wage.

**Labor-Earnings Demand**
is decreasing
in . Therefore, equation
implies
a negative relationship between and
labor-earnings demand as measured by
. Thus, in
space the
labor-earnings demand function is downward sloping.

**Labor-Earnings Supply** For labor-earnings supply consider first the case in which only
clones of firm exist. Then, is given by

.

Showing that in space labor-earnings supply is downward sloping requires answering the following three questions.

(a) *What does a change in*
*imply for amenities*? Suppose that the marginal value of
wealth rises to
. Then, as shown in the
left panel of Figure 7, amenities decrease. This means that the
surplus from amenities received by individuals,
,
declines, which--as shown in the right panel of Figure 7--induces a
downward shift in the net job utility function in
space.

Figure 7: Derivation of Labor-Earnings Supply Curve

(b) *What does a change in*
*imply for the isocost lines*? The right panel of Figure 7
shows that higher
implies a steeper isocost
line, which in turn leads to a decline in net job utility and a
rise in effort. Also, although the change can seem ambiguous, job
benefits rise to
, which leads to higher work
hours.^{14}
means that the in
goes up.

(c) *How do real wages factor in*? If all firms are
identical
is trivially equal to . The analysis behind Figure 7 showed that the result of
higher marginal value of wealth includes lower amenities,
, and higher effort, . is unchanged, and since

.

Taken together, the answers to these three questions imply that labor-earnings is increasing in so that is upward sloping in space.

**Determination of the Marginal Value of Wealth** Figure 8 shows and , and the determination of equilibrium and labor earnings
when all firms are
identical.

Figure 8: Equilibrium Labor Earnings and the Marginal Value of Wealth Using Labor-Earnings Supply and Demand

What about the determination of the marginal value of wealth and labor earnings when firms with a range of wage/effort combinations are operational? For simplicity, consider the case of two types of firms indexed by , which, as noted in Section 5.2.2, can be thought of as the relevant extremes.

Suppose these two types of firms have job utility functions given by and as depicted in Figure 3. Then, what is relevant is the upper envelope of these job utility functions. For a sufficiently low marginal value of real wealth, say , firm 1 is able to offer the highest marginal net job benefits and type 2 firms do not operate. For a higher marginal value of real wealth, say, both type 1 and type 2 firms are able to offer the same marginal net job benefits and workers allocate hours across firms according to the logic in Section 5.2.2. Finally for even higher marginal values of real wealth such as, say, type 2 firms are able to offer the highest marginal net job benefits, and type 1 firms are unable to operate.

Market equilibrium can be shown in the labor-earnings supply and demand diagram. is a simple extension what we derived above. In particular, labor-earnings demand is described by

,

where is the fraction of total work hours devoted to firms of type 1. The appropriate version of labor-earnings supply is slightly different than that considered earlier. For sufficiently low values of only firms of type 1 operate and the associated real wages, marginal net job benefits, and work hours are relatively low. Therefore, in terms of labor-earnings supply, low values of are associated with low labor earnings.

At the critical value noted above both types of firms are operational. Figure 9 shows an equilibrium in which both types of firms are operational. Wages, marginal net job benefits, and hours are higher than under -and therefore so are labor earnings. However at any level of labor earnings within a certain range is an equilibrium, implying a perfectly elastic portion of the labor-earnings supply curve. In this region, an increase in non-labor income that shifts out leads to allocations of more hours toward the more pleasant job without changing .

Finally, for higher values of only firms of type 2 are operational. This is associated with higher wages, marginal net job benefits, and hours. Thus, in terms of labor-earnings supply high values of are associated with high values of labor earnings.

Figure 9: Labor Earnings Supply and Demand With Two Firms

Our framework allows us to address several interesting questions. For instance: How does a firm's overall technology matter for its competitiveness? What are the effects of changes in technology (whether changes in labor-augmenting technology or job-enjoyment technology) on labor earnings and the marginal value of wealth? Which changes in technology are consistent with higher real wages and trendless labor hours if the income effect outweighs the substitution effect?

In the Appendix, we show the following. First, within our framework, differences in job-enjoyment technology between firms can counterbalance differences in labor-augmenting technology, and vice versa. In particular, a firm falling behind in labor-augmenting technological progress can keep up its ability to attract workers even with lower wages if its job enjoyability technology advances sufficiently. Second, within our framework, a permanent increase in labor augmenting technology, a permanent positive innovation in the nature of work proper, or a permanent positive innovation in the nature of the work environment can each lead simultaneously to higher labor earnings, a lower marginal value of real wealth, and trendless or nearly trendless work hours.

In essence, then, anything that "regular" technology can do, job enjoyability technology can do as well. To the extent that higher job utility matters for competitiveness, it is even plausible that firms might set what would otherwise be above-optimal effort requirements in order to induce workers themselves to think of ways to increase job utility. This amounts to a low cost form of research and development in job enjoyment technology.

We argue above that and upward trend in job utility make it possible for work hours to remain approximately constant over time even if the income effect of higher real wages on labor supply exceeds the substitution effect of higher real wages. The question that immediately follows is: What are the welfare effects of such changes? In this section, we elaborate on the relationship between job utility and welfare, suggest ways in which theoretical relationships can be operationalized and give a numerical example for the potential welfare gains associated with secular changes in job utility. Under straightforward though far from certain assumptions, given constant work hours, an observed increase in consumption of 1% might be associated with an increase in welfare of 2%. In this case, at least half of these welfare gains are coming from increases in job utility.

In our framework, changes in welfare induced by changes in exogenous parameters are well assessed via comparative steady-state analysis. In steady state, given , an individual's problem is equivalent to the static optimization problem

s.t

and

.

Given the multipliers and , let

Recall that the optimal choice of yields two cases: and , or and . Therefore, , where, denotes the economy's level of equilibrium marginal net job benefits.

Using the envelope theorem,

. | (8) |

Above, each of the three terms on the right-hand side highlight distinct ways in which the economy's opportunity set becomes larger. Changes in welfare from changes in job utility are captured by the first term; changes in welfare from higher wages are reflected in the second term; and changes in welfare from changes in exogenous wealth appear in the last term. The first term can be interpreted as the portion of the change in the maximized value of utility that answers the question of how much the worker would have to be paid per year in order to be willing to go back to working in yesterday's conditions.

To better understand the implications of the envelope theorem as laid out in equation (8) note that the second term on the right-hand side is the change in wages for narrowly defined job categories (for which, empirically, it should be possible to obtain a direct measure) and satisfies

.

Therefore, to gauge this component of welfare, we need to adjust the change in overall labor earnings by subtracting not only extra earnings from people working longer hours overall, but also extra earnings coming from people switching towards jobs that are more highly paid and have lower job utility. If is moving down, then the overall trend should involve compositional shifts towards jobs with higher job utility and relatively lower pay than other available jobs. This means that the increase in labor earnings will tend to understate the true increase in welfare (leaving aside changes in overall hours, which obviously need to be adjusted for).

In terms of understanding the remaining terms for the change in welfare, note that

which implies

.

Thus, pinning down the first term in the right-hand side of equation (8) calls for looking at labor hours, consumption, and hourly wages. Substituting into equation (8) and rearranging yields

. | (9) |

The last term on the right-hand side-the value of extra non-labor income-is easy to understand. Hence, we will focus on getting measures for the first two terms on the right-hand side of equation (9).

Define . (That is, is the elasticity of intertemporal substitution.). Then . Moreover, as discussed earlier, for any job the Frisch elasticity of labor supply and the fraction of the wage that is a compensating differential, , where , it follows that

. | (10) |

Substituting the appropriate expressions into equation (9) and simplifying yields

. | (11) |

The intuition for equation (11) is that in the additively separable case tells how many times bigger the income effect is than the substitution effect. If hours are relatively constant despite increasing wages, then there must be substantial increases in job utility to counteract the income effects associated with increases in consumption. On the other hand, if hours move in the direction indicated by the income effect it gives less hint of improvements in job utility. (If , income and substitution effects cancel, but increases in consumption still have the usual effect on welfare.).

In addition to evidence from the effects of interest rates on the path of consumption, in principle evidence about can be found from workers' job choices. Consider an individual working two jobs satisfying . Then, , meaning that

.

For any individual with , for example, , then

,

and using it follows that

.

The short-run elasticity of intertemporal substitution has been suggested by Hall (1988) to be approximately zero, and by Kimball, Sahm, and Shapiro (2011) to be 0.08. However, there are reasons to think the long-run elasticity of intertemporal substitution should be higher than its short-run counterpart. This includes taking account of full adjustment, new goods, habit formation, and "keeping up with the Joneses." In the context of our analysis, it is the long-run elasticity of intertemporal substitution that should be used. Suppose the long-run elasticity of intertemporal substitution is 0.5, in which case . Using this value for along with equation implies that for , , and , a 1% increase in consumption would be associated with a welfare increase of at least 2%.

A natural question that follows is what fraction of welfare gains are attributable to higher job utility. To see this, note that dividing equation (8) by and combining it with equation (11) yields

or

, | (12) |

where the second term on the left-hand side reflects switching from relatively higher paid jobs to relatively lower paid jobs. If there were no changes in job utility or hours then a 1% increase in consumption is just a 1% increase in consumption. But, if consumption increases 1%, , endogenously despite the income effect exceeding the substitution effect, then this equation implies an increase in welfare equivalent to the direct effect of a 2% increase in consumption. So, the difference, 1%, must be due to improvements in job utility from the two terms on the left of equation (12).

The paradox of hard work is this: for decades, work hours per capita among adults have remained roughly trendless, despite strong trends in macroeconomic variables, such as real consumption and real wages. In principle, the paradox of hard work can be rationalized in several different ways. Of these alternatives, we focus on the general equilibrium effects of secular changes that make work more pleasant. Economists have long understood that cross-sectional differences in job utility at a particular time give rise to compensating differentials. In this paper, we develop a theory that focuses on the less-studied long-run macroeconomic consequences of trends in job utility.

Our theory allows for the interaction of *work hours*
(which stands in for all aspects of the job that interfere with
leisure and home production) and *effort* (which stands in for
all aspects of a job whose cost is in terms of proportionate
changes in effective productive input from labor). We also consider
the role of *amenities* (which we define to be job
characteristics whose cost is in terms of goods) and the role of
secular increases in job utility (that is, secular declines in
drudgery, which can stem from changes in standard notions of
technology, such as labor-augmenting technology, and also from
changes in job-enjoyment technology). General equilibrium can be
analyzed through two new theoretical objects: *labor-earnings
supply and labor-earnings demand*.

Two main implications emerge. First, secular improvements in job utility imply that work hours can remain approximately constant over time even if the income effect of higher wages on labor supply exceeds the substitution effect of higher wages. Second, secular improvements in job utility can themselves be a substantial component of the welfare gains from technological progress. These two implications are connected by an equation flowing from optimal hours choices: improvements in job utility that have a significant effect on labor supply tend to have large welfare effects.

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Firms maximize net job benefits given the constraints they face. In particular,

.

The envelope theorem implies that when changes

whenever . Since this is true for all jobs, the maximum over all must also increase.

The fact that highlights an interesting role for amenities. Consider a decline in the marginal value of wealth. In the absence of amenities, in space the job utility function would remain fixed while isocost curves became less steep and job benefits declined. Yet, once amenities are considered, a lower marginal value of wealth shifts the net job utility function shifts up in space. Because of the logic of the envelope theorem job benefits must still decline, but not as much as they would in the absence of amenities. Thus, endogenous provision of amenities blunts the effect of lower . In other words, changes in amenities serve as endogenous buffers to income effects on labor supply.

Across firms, differences in job-enjoyment technology can counterbalance differences in labor-augmenting technology, and vice versa. To see this, consider firms 1 and 2 as shown in Figure A1, where , , and firms differ in their net job utility curves. As depicted, although firm 1 has lower labor-augmenting technology, given its higher job-enjoyment technology it is the one that would implicitly set the economy's equilibrium level of job benefits (recall that, all else equal, higher shifts the job utility curve up). Because workers take jobs with the highest , firm 2 is unable to attract workers--and therefore must shut down.

For a higher value of (which would shift sufficiently high up) or a higher (which would make firm 2's isocost lines sufficiently steep) firm 2 could offer the exact same level of job benefits as firm 1--in which case both firms would be able to operate--or even higher job benefits--in which case firm 2 would be the one to implicitly establish economy-wide equilibrium , and firm 1 would be unable to attract workers.

Figure A1: A Difference in Job Utility Overwhelming a Difference in Labor-Augmenting Technology

For the sake of intuition, throughout the remainder of this section we make four simplifying assumptions. 1) We revert to assuming that there is only one firm and therefore avoid indexes. 2) For the effects of changes in the nature of work proper, , three possibilities emerge depending on whether , , or . means that changes in do not affect how onerous extra effort is. means that higher makes extra effort more onerous. means that higher makes increases in effort less onerous. We focus on since it is the most intuitively appealing possibility. 3) Base on another bit of intuition, we only consider cases in which . 4) We continue to assume the additively separable case . Relaxing these assumption leads to interesting analysis but not quite interesting enough to include here.

Suppose labor-augmenting technology increases from to . The left panel of Figure A2 shows that, all else equal, higher leads to higher job benefits (meaning higher work hours) and higher effort, which leads to higher real wages because the effective wage is constant. These changes jointly imply higher . Now, consider the implications of higher . shifts out because at any given higher is consistent with higher labor earnings. This outward shift in implies a decrease in equilibrium and an increase in equilibrium (the lower induces changes exactly opposite to those in the left panel of Figure 8 in the main text).

Figure A2: Effects of Increase in Labor-Augmenting Technology and Effects of Positive Innovation in the Nature of Work Proper

Consider an increase in to (that is, a positive innovation in the nature of work proper). Start from the right panel of Figure A2, where is assumed: all else equal, higher is consistent with higher job benefits (meaning higher work hours) and higher effort (meaning--because the effective wage is an exogenous constant-- higher real wages). If the new effort remains unchanged but job benefits rise. In either case, labor earnings rise. All other changes are then analogous to those in Section B.2.1.

If and rises (that is, a positive innovation in the nature of the work environment occurs), the optimal level of amenities rises as shown in the left panel of Figure A3. This induces an upward shift in the net job utility function akin to that shown in the right panel of Figure 8 in the main text, but without any accompanying change in the slope of isocost lines. Therefore, effort remains fixed. Because the effective wage is an exogenously determined constant, all else equal, higher amenities imply that real wages must decline. So, although job benefits are higher, the net effect on labor earnings, , is ambiguous. If instead and rises, as shown in the right panel of Figure A3 the level of amenities remains fixed, but the surplus from amenities rises. This induces an upward shift in the net job utility function, which is consistent with effort remaining fixed and job benefits rising. Because the effective wage must remain constant, real wages rise, and all other change are analogous to those in Section B.2.1.

Figure A3: Effect of Positive Innovation in the Nature of the Work Environment

Consider an initial equilibrium such as point
in the left panel of Figure A4, which corresponds to an isocost
line with slope
. Then, if labor-augmenting
technology rises, or there is a positive innovation in the nature
of work proper and
, or there
is a positive innovation in the nature of the work environment and
, as shown
in Section B.2 labor
earnings rise and the marginal value of wealth decreases. And, at
lower amenities are optimally higher, and
the surplus from amenities is also higher--which is consistent with
an upward shift in the net job utility function (with no change in
its slope) and less steep isocost lines. If there is no change in
labor hours, then the new equilibrium must be at a point such as
' in the left panel of Figure A4. There,
effort is lower but the effective wage
is unchanged.^{15}

Figure A4: Impact of Technological Changes

Increase in Labor-Augmenting Technology In the case in which rises, because effort declines and amenities rise, the real wage can only be higher after the increase in labor-augmenting technology if the product is higher and proportionally greater than the increase in amenities. In mathematical terms, because the effective wage must remain constant, then a rise in triggers a rise in real wages only if

.

**Increase in Labor-Augmenting Technology** In such case, because after the rise in real wages
are higher and so is job utility, then work hours remain constant
as a result of the rise in job utility countervailing the income
effect's outweighing of the substitution effect. So, an increase in
labor-augmenting technology can indeed be consistent with higher
real wages and trendless labor hours (and higher effective labor
productivity).

**Positive Innovations in Job-Enjoyment Technology** If labor-augmenting technology rises, or there is a positive
innovation in the nature of work proper and
, or there
is a positive innovation in the nature of the work environment and
, then,
again, at point ' effort is lower. Because
amenities are higher and the effective wage must remain constant,
then given that the product is lower real
wages must decline. And this decline must exactly satisfy

.

So, all else equal, neither a positive innovation in the nature of work proper with nor a positive innovation in the nature of the work environment with are consistent with both trendless work hours and higher real wages.

Consider an initial equilibrium such as point in the right panel of Figure A5, which corresponds to an isocost line with slope . Then, given a positive innovation in the nature of work proper with , as shown in Section B.2.2 labor earnings rise and the marginal value of real wealth decreases. And, at lower amenities are optimally higher, and the surplus from amenities is also higher--which is consistent with an upward shift in the net job utility function (with change in slope as implied by ) and less steep isocost lines. If there is no change in labor hours but the income effect outweighs the substitution effect, then the new equilibrium must be at a point such as ' in the left panel of Figure A4--job utility must be higher. At point effort is higher but the effective wage must remain unchanged. Because amenities are also higher, real wages are higher only if

.

So, when positive innovations in the nature of work proper make effort less taxing, a rise in can indeed be consistent with higher real wages and trendless labor hours (and higher effective labor productivity).

Comparison of the left and right panels of Figure A4 along with results from Sections B.3.1 and B.3.2 imply that, in principle, the impact of an increase in labor-augmenting technology can be exactly equal to the impact of a positive innovation in the nature of work proper.

1. The views in this paper are solely the responsibility of the authors and should not be interpreted as reflecting the views of the Board of Governors of the Federal Reserve System or of any other person associated with the Federal Reserve System. The authors are thankful, without implicating, for comments received by seminar participants at the University of Michigan and also during visits to the Board of Governors of the Federal Reserve System, Brown University, the Federal Reserve Bank of Atlanta, the Federal Reserve Bank of Philadelphia, the Federal Reserve Bank of Richmond, and McMaster University. Return to text

2. Board of Governors of the Federal Reserve System (e-mail: [email protected]). Return to text

3. Professor, University of Michigan, and NBER ([email protected]). Return to text

4. See Prescott (2004), Alesina, Glaeser, and Sacerdote (2006), Rogerson (2006, 2007, and 2009), Faggio and Nickell (2007), Ljungqvist and Sargent (2007), Ohanian, Raffo, and Rogerson (2008), Shimer (2009), Fang and McDaniel (2011), McDaniel (2011), Guner, Kaygusuz and Ventura (2012), and Epstein and Ramnath (2014) for complementary work related to cross-country differences in hours worked per population. Return to text

5. See also, for example, Altonji (1982), Card (1994), Patterson and Pesaran (1992), Fuhrer (2000), Vissing-Jorgensen (2002), and Yogo (2002). Return to text

6. For additional discussion, see, for instance, Shapiro and Kimball (2008). Return to text

7. See, for instance, Abel (1990), Fuhrer (2000), Luttmer (2005), Rayo and Becker (2007), and Struck (2013). Return to text

8. It follows that our research is broadly related to many literatures. These literatures include, but are not limited to, work by MaCurdy (1981), Altonji (1982 and 1986), Hansen (1985), Mankiw, Rotemberg and Summers (1985), Rogerson (1988), Blundell, Meghir, and Neves (1993), Mulligan (1998), Blundell and MaCurdy (1999), Blundell, Chiappori, Magnac, and Meghir (2001), Mulligan (2001), Coulibaly (2006), Krusell, Mukoyama, Rogerson, and Sahin (2008), Francis and Ramey (2009), Prescott, Rogerson, and Wallenius (2009), and Prescott and Wallenius (2011). Return to text

9. See Epstein and Nunn (2013) for a treatment of amenities in an environment with search frictions. Return to text

10. The relative price of amenities can simply be thought of as being part of the overall technological component . Indeed, think of production of firm s th ammenity as

,

where is technology and is the amount of the firm's total output, , devoted to producing the amenity. Then, the firm's total expenditure on amenity is and we define . Thus, for instance, an increase in technology decreases the relative price of the th amenity. Except when the real prices of amenities are visible in markets it might be impossible to distinguish between an improvement in job-enjoyment technology and a fall in the price of an amenity. Return to text

11. We consider this to be the more intuitive case, although our results are unaltered by assuming that job utility is always decreasing in effort. Return to text

12. The worker's problem would be dramatically different if it were possible to devote negative work hours to unpleasant, badly paid jobs. Return to text

13. Consider with , where is a constant. Define and . Then, , and

. |

14. See the appendix for additional details. Return to text

15. Note that

This version is optimized for use by screen readers. Descriptions for all mathematical expressions are provided in LaTex format. A printable pdf version is available. Return to text