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MENTAL MODEL · M5088

Debt-Deflation Spiral

Debt-Deflation Spiral
BusinessHigh supportMacroeconomics
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Updated 2026-08-08

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INTRODUCTION

English translation pending.

CORE DEFINITION

The debt-deflation spiral, proposed by Irving Fisher, describes a chain that turns an ordinary recession into a depression. Firms and households sell assets to repay debt, which drives asset prices down. Falling prices lower collateral values, so banks contract credit, which cuts spending and investment further, deepening deflation and raising the real burden of every remaining debt. The trap is that each individual's repayment is rational, yet in aggregate it destroys the balance sheets of all.

SCAFFOLDING EFFECT

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- Chain tracing: Map whether distress is feeding back into asset prices and credit in a loop. - Policy direction: Break the loop with monetary easing, fiscal stimulus, or debt restructuring instead of tightening it. - Aggregate sanity check: Ask whether individually rational actions are collectively destructive before prescribing virtue.

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Proposed by Irving Fisher in 1933, the spiral turns on the fact that debt is fixed in nominal terms while income and collateral are not, so deflation raises the real value of what is owed. Repayment requires selling assets, which lowers prices, which lowers collateral, which contracts lending, which lowers income. The loop is self-reinforcing because every step strengthens the next, and what is virtuous for one borrower, paying down debt, is poisonous when everyone does it at once, the classic fallacy of composition.

MINIMUM ACTION

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