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MENTAL MODEL · M5907

Financial Accelerator

Financial Accelerator
BusinessHigh supportMacroeconomics
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

The financial accelerator describes how credit markets magnify economic shocks. The core claim is that a small downturn reduces firm asset values, which weakens collateral, which leads banks to contract credit, which forces firms to sell assets, which lowers asset values further. The qualification is that the mechanism runs through balance sheets and borrowing constraints rather than through the original shock, so the credit friction, not the initial disturbance, determines how severe the outcome becomes.

SCAFFOLDING EFFECT

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- Procyclical Damage: Credit extends umbrellas in sunshine and withdraws them in rain, so leverage must be managed with the cycle. - Amplification Loop: In booms the accelerator lifts you higher; in downturns it drives you deeper. - Deleveraging Discipline: Reducing leverage during good times is the only reliable protection against the loop.

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A negative shock weakens firm and household balance sheets, lowering net worth and collateral value. Banks respond by tightening credit, which cuts investment further, which weakens balance sheets again. The result is a procyclical feedback loop in which credit constraints, not the original shock, drive the amplitude of the downturn.

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Source support: Explicit

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