Abstract: This paper describes a feedback effect between real and financial development. The paper presents a new variable, which we call the cost of financial intermediation, through which the feedback between finance and growth operates. The theoretical part of the paper describes how specialization of financial intermediaries leads to such a feedback effect. The main result of this feedback is that differences in productivity across countries are amplified by financial intermediation. The empirical part of the paper uses U.S. cross-state data from banks' income statements to measure the cost of financial intermediation and to provide evidence for the feedback effect between finance and growth.

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