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Interest Is Not the Marginal Product of Capital

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. Full story here Are you the author?
Robert P. Murphy
Robert P. Murphy is a Senior Fellow with the Mises Institute. He is the author of many books. His latest is Contra Krugman: Smashing the Errors of America's Most Famous Keynesian. His other works include Chaos Theory, Lessons for the Young Economist, and Choice: Cooperation, Enterprise, and Human Action (Independent Institute, 2015) which is a modern distillation of the essentials of Mises's thought for the layperson. Murphy is co-host, with Tom Woods, of the popular podcast Contra Krugman, which is a weekly refutation of Paul Krugman's New York Times column. He is also host of The Bob Murphy Show.
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