MENTAL MODEL · M5802

Permanent Income Hypothesis

DecideHigh supportDecision Science

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Consumers' consumption decisions depend not on current income but on their expected total lifetime income (permanent income). Temporary income increases (e.g., bonuses) are mainly saved, while only permanent income increases (e.g., promotions) significantly boost consumption.

SCAFFOLDING EFFECT

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The consumption smoothing mechanism. It explains why one-time consumption vouchers often have poor effects (people save them). To stimulate consumption, expectations about future long-term income (confidence) must be changed.

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Consumers smooth consumption based on the present value of their expected lifetime total resources (permanent income), rather than reacting to each period's income fluctuations. Temporary income changes are mostly absorbed by savings; only expected permanent changes alter the consumption path. This stems from intertemporal optimization.

MINIMUM ACTION

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Practice this model in one real situation:

When evaluating stimulus policies or marketing effects, distinguish between 'one-time' and 'persistent' signals: the former are often saved and have weak effects
the latter change behavior. To influence consumption, businesses or governments must change expectations about long-term income (confidence).

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Source support: Explicit

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