MENTAL MODEL · M3926

Say's Law

BusinessHigh supportEconomics

Included

Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

"Supply creates its own demand." The core idea is that production activity itself creates sufficient income and demand to purchase the produced goods, so the economy cannot experience general overproduction (i.e., "insufficient aggregate demand").

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Corrects demand-side thinking. It emphasizes that "production" and "income" are two sides of the same coin, helping to understand why "supply-side reforms" are sometimes more effective than "demand stimulus." However, it overlooks the "demand gap" caused by "money hoarding" and "deteriorating expectations."

anchor

Anchor fast decisions

Classical economics proposition: supply creates its own demand; production creates purchasing power equal to the value of the goods produced, so general overproduction cannot persist in the long run.

MINIMUM ACTION

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Practice this model in one real situation:

When analyzing macroeconomic conditions, distinguish between the long run and the short run. In the long run, emphasize supply capacity
in the short run, acknowledge the possibility of insufficient effective demand.

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Source support: Explicit

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Say%27s_lawZH · Explicit
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