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MENTAL MODEL · M4691

Private Goods

Private Goods
BusinessHigh supportMicroeconomics
Included
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Updated 2026-08-02

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INTRODUCTION

English translation pending.

CORE DEFINITION

Private goods are excludable, meaning owners can prevent others from using them, and rivalrous, meaning consumption by one person reduces what remains for others. Food, clothing, and automobiles are standard examples, and most goods traded in markets fall into this category. The two properties together make pricing feasible, because sellers can withhold access and charge for each unit consumed. The classification, formalized in Paul Samuelson's work on public expenditure, sits alongside public goods, common-pool resources, and club goods in a two-by-two typology. Goods that lose either property usually require different allocation mechanisms.

SCAFFOLDING EFFECT

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- Classify the good: test excludability and rivalry before choosing a market or non-market mechanism. - Spot market failure: identify where goods lose excludability or rivalry and prices stop working. - Choose policy: decide whether pricing, quotas, or public provision fits the resource's properties.

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Excludability lets a seller deny access, so a price can be charged. Rivalry means each additional unit consumed costs society something, so charging a price sends the right signal to ration the good. Together the two properties align private incentives with social cost, which is why competitive markets allocate private goods efficiently and why the same mechanisms misfire when either property is missing.

MINIMUM ACTION

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