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MENTAL MODEL · M3469

Samuelson's Theory of Public Goods

Samuelson's Theory of Public Goods
BusinessHigh supportPublic Economics
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

A theory of public goods developed by Paul Samuelson. A pure public good is non-rival, meaning one person's consumption does not reduce what others can consume, and non-excludable, meaning nobody can be kept from using it. Because users cannot be charged individually, markets supply too little of such goods and voluntary contribution invites free riding. The efficient level satisfies the Samuelson condition, under which the sum of everyone's marginal benefit equals marginal cost. Determining that level and financing it requires a political process and a tax scheme rather than a market transaction.

SCAFFOLDING EFFECT

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- Good Classification: decide whether the item is private, club, common or public before designing supply. - Provision Rule: sum marginal benefits vertically to find the efficient quantity. - Financing Question: choose taxes or user fees that match the good's excludability.

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Non-excludability means providers cannot capture the benefit, so nobody has an incentive to produce the good voluntarily. Non-rivalry means the efficient price of serving one more user is zero, which makes exclusion wasteful even where it is technically possible. Together they produce a systematic gap between private supply and the social optimum. The Samuelson condition repairs that gap on paper by aggregating demand vertically, and voting plus taxation is what translates it into actual provision.

MINIMUM ACTION

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Source support: Explicit

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