[5] In the reams of commentary on J.M. Keynes’ General Theory, no one has noticed the very revealing passage in which Keynes criticizes Mises’ discussion of this point. Keynes asserted that Mises’ “peculiar” new theory of interest “confused” the “marginal efficiency of capital” (the net rate of return on an investment) with the rate of interest. The point is that the “marginal efficiency of capital” is indeed the rate of interest!
It is a price on the time market. It was precisely this “natural” rate, rather than the loan rate, that had been a central problem of interest theory for many years. The essentials of this doctrine were set forth by Böhm-Bawerk in Capital and Interest and should therefore not have been surprising to Keynes. See John Maynard Keynes, The General Theory of Employment, Interest and Money (New York: Harcourt, Brace & Co., 1936), pp. 192–93. It is precisely this preoccupation with the relatively unimportant problems of the loan market that constitutes one of the greatest defects of the Keynesian theory of interest."
6 PRODUCTION:THE RATE OF INTEREST AND ITS DETERMINATION, "Man, Economy and The State", Murray N. Rothbard
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