Microfoundations

In economics, the term microfoundations refers to the microeconomic analysis of the behavior of individual agents such as households or firms that underpins a macroeconomic theory (Barro, 1993, Glossary, p. 594).

Most early macroeconomic models, including early Keynesian models, were based on hypotheses about relationships between aggregate quantities, such as aggregate output, employment, consumption, and investment. Critics and proponents of these models disagreed as to whether these aggregate relationships were consistent with the principles of microeconomics. Therefore, in recent decades macroeconomists have attempted to combine microeconomic models of household and firm behavior to derive the relationships between macroeconomic variables. Today, many macroeconomic models, representing different theoretical points of view, are , allowing economists to test them both with macroeconomic and microeconomic data.

Critics of the Keynesian approach to macroeconomics soon pointed out that some of Keynes' assumptions were inconsistent with standard microeconomics. For example, Milton Friedman's microeconomic theory of consumption over time (the 'permanent income hypothesis') suggested that the marginal propensity to consume out of temporary income, which is crucial for the Keynesian multiplier, was likely to be much smaller than Keynesians assumed. For this reason, many empirical studies have attempted to measure the marginal propensity to consume (Barro, 1993, Ch. 3, p. 87), and macroeconomists have also studied alternative microeconomic models (such as models of credit market imperfections and precautionary saving) that might imply a higher marginal propensity to consume.

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