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MENTAL MODEL · M11796

Paradox of Thrift

Paradox of Thrift
BusinessHigh supportMacroeconomics
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Updated 2026-08-13

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INTRODUCTION

English translation pending.

CORE DEFINITION

The paradox of thrift holds that in a recession, when every household saves more and spends less, aggregate demand falls, income and employment contract, and the saving each household pursued becomes harder or impossible to achieve. The core proposition, set out by Keynes, is that saving is individually rational yet collectively self-defeating, a fallacy of composition in which what holds for one part fails for the whole. The key qualification is that the paradox belongs to a downturn with idle capacity; in the long run saving still funds investment.

SCAFFOLDING EFFECT

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- Level distinction: ask whether the reasoning holds for one household or for the whole economy. - Demand check: in a downturn, trace what happens to income when everyone cuts spending. - Policy inversion: expect public spending to rise when private saving does, not to follow it.

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One household's spending is another household's income, so a general retreat from spending reduces the income out of which saving is drawn; each saver's attempt to build a buffer shrinks the total from which all buffers come. The loop runs from saving to lower demand to lower output and employment and back to lower income, which is why the aggregate outcome inverts the individual intention.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Paradox_of_thriftZH · Explicit
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