Examine the theoretical underpinnings of the permanent income hypothesis formulated by Milton Friedman. What does the theory posit regarding consumer spending behavior?

💡 Solution & Explanation

Milton Friedman's permanent income hypothesis asserts that individuals base their consumption choices on permanent income, which is the long-term expected average yield from human and physical wealth, rather than volatile transitory income shocks. Temporary windfalls or short-term income drops lead to substantial shifts in saving rather than consumption, because households smooth their lifestyle expenditure over time. This framework successfully resolves the empirical puzzle where short-term cross-sectional consumption functions differed from long-term time-series data. Friedman was awarded the Nobel Prize in Economic Sciences in 1976 for contributions to consumption analysis.