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MENTAL MODEL · M4285

The Lucas Paradox

The Lucas Paradox
BusinessHigh supportMacroeconomics
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Updated 2026-08-08

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INTRODUCTION

English translation pending.

CORE DEFINITION

Named after economist Robert Lucas, who posed it. Standard theory holds that capital should flow from rich countries, where returns are low, to poor countries, where capital is scarce and returns should be high. In practice capital flows mostly among wealthy countries and sometimes moves from poor to rich ones. Lucas attributed the gap to differences in human capital and institutional quality, which raise the effective risk of investing in poorer economies.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Screen destinations: weigh property rights, legal enforcement, and political risk alongside headline returns - Adjust for risk: compare risk-adjusted returns rather than raw theoretical rates - Build the case: recognize that improving institutions attracts capital more reliably than promising growth

anchor

Anchor fast decisions

Capital chases risk-adjusted returns, not theoretical ones. In poor countries, weak property rights, unreliable courts, thin human capital, and political instability raise the probability of expropriation or loss, which offsets the higher marginal product of capital. Where those frictions are severe enough, the risk-adjusted return falls below that of a rich country, so capital stays home or moves the other way.

MINIMUM ACTION

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Source support: Explicit

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