Cognitive Scaffold

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MENTAL MODEL · M4315

Public Goods Game

Public Goods Game
BusinessHigh supportEconomics
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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

A standard experimental game in behavioral economics. Each player decides how much of an endowment to contribute to a common pool; the total is multiplied and divided equally among all players regardless of contribution. The individually rational move is to contribute nothing and free-ride, yet universal free-riding leaves everyone worse off than universal contribution. Introducing costly punishment for low contributors typically raises cooperation substantially.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Model a collective: identify who benefits without contributing and what the pool actually rewards - Test a rule: predict contribution levels before and after adding a sanction - Design enforcement: prefer a cheap, credible penalty over appeals to goodwill

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Anchor fast decisions

Each contribution benefits everyone equally, so the contributor captures only a fraction of the value they create while bearing the whole cost. That asymmetry makes free-riding dominant for a purely self-interested player. Because many people contribute at first and then resent being exploited, cooperation decays without enforcement; a credible penalty changes the payoff so that contributing again beats free-riding.

MINIMUM ACTION

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Source support: Explicit

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