Marginal efficiency of capital

Definition and stakes

Portrait of John Maynard Keynes John Maynard Keynes The General Theory of Employment… (1936)

We have seen above that the marginal efficiency of capital depends, not only on the existing abundance or scarcity of capital-goods and the current cost of production of capital-goods, but also on current expectations as to the future yield of capital-goods. In the case of durable assets it is, therefore, natural and reasonable that expectations of the future should play a dominant part in determining the scale on which new investment is deemed advisable.
Source: Gutenberg

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