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MENTAL MODEL · M5159

Lindahl Equilibrium

Lindahl Equilibrium
BusinessHigh supportPublic Economics
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Updated 2026-08-03

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INTRODUCTION

English translation pending.

CORE DEFINITION

A model of efficient public good provision developed by Erik Lindahl. Each individual is assigned a personalized price, called a Lindahl price, equal to their marginal benefit from the public good. At those prices, everyone demands the same quantity, and that common quantity is the efficient level satisfying the Samuelson condition that marginal benefits sum to marginal cost. The equilibrium is a benchmark rather than a description of real politics, because it requires each person to reveal their true valuation, which creates a strong incentive to understate it and free ride.

SCAFFOLDING EFFECT

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- Pricing design: charge subscription tiers in proportion to the value each user actually receives. - Cost sharing: allocate a shared resource's cost by measured marginal benefit rather than equally. - Mechanism warning: expect people to understate their valuation whenever their stated share determines their bill.

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A public good is non-rival, so one unit serves everyone at once and the efficient quantity equates total marginal benefit to marginal cost. Charging a uniform price forces some users to pay more than their benefit and others less, which distorts demand. Personalized prices matching individual marginal benefit make each person's demand align with the efficient quantity, but the same personalization gives everyone a reason to misreport, which is why the benchmark is rarely implementable without a revelation mechanism.

MINIMUM ACTION

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Source support: Explicit

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