The Theory of Investment
Keynes characterized his contribution as “a theory of why output and employment are so liable to fluctuation” (QJE, p. 221). In the “pure” theory, where government and foreign demand are ignored, employment depends upon consumption and investment demand. Consumption demand is passive, as it “depends mainly on the level of income” (QJE, p. 219), that is, on the sum of consumption and investment demand.
KeywordsInterest Rate Cash Flow Money Supply Capital Asset Capitalization Rate
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