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MENTAL MODEL · M3492

Tax Elasticity

Tax Elasticity
BusinessHigh supportPublic Economics
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

In public economics, tax elasticity measures how much revenue responds to a change in the tax base or in the statutory rate. Revenue elasticity captures the response to the base, typically GDP, while rate elasticity captures the response to the rate itself. Because a rate increase also shrinks the base, rate elasticity is usually smaller than a naive calculation implies, which is the arithmetic behind the Laffer curve debate. The measure underpins assessment of automatic stabilisers, revenue forecasting, and fiscal sustainability, and it differs sharply across tax types.

SCAFFOLDING EFFECT

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- Stabiliser screening: Compare revenue elasticities to find which taxes cushion downturns automatically. - Structure design: Mix elastic and inelastic taxes so revenue holds through the cycle. - Shock planning: Forecast revenue swings from the known elasticity of each tax before a downturn arrives.

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When the economy contracts, revenue from a highly elastic tax falls faster than GDP, while a low-elasticity tax keeps collecting. That difference is what makes some taxes act as automatic stabilisers: they drain less demand in a boom and take less in a slump without any new legislation. The same mechanism explains why raising a rate can leave revenue flat or lower once the base shrinks in response to the higher rate.

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Source support: Explicit

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