Interest Is Not the Marginal Product of Capital

from The Human Action Podcast · host Robert P. Murphy

Bob revisits capital and interest theory to show why the textbook result “interest = MPK” only holds in a one-good world, and why in actual markets the interest rate emerges from time, prices, and capital valuation—not raw productivity.Bob and Alberto Bisin Discuss the Use of Mathematics in Economics: Mises.org/HAP527aBob's Dissertation, "Unanticipated Intertemporal Change in Theories of Interest": Mises.org/HAP527bThe Mises Institute is giving away 100,000 copies of Hayek for the 21st Century. Get your free copy at Mises.org/HAPodFree

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This episode was published on November 23, 2025.

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