Group reciprocity and the evolution of stereotyping

TL;DR

This paper explores how group reciprocity influences the evolution of stereotypes, showing that coarse stereotypes tend to be negative, overly pessimistic, and driven by cognitive costs, with crises amplifying negative biases.

Contribution

It provides a theoretical framework linking stereotype warmth, reciprocity, and costs of cognition, and explains how external shocks can intensify negative stereotypes.

Findings

Coarse stereotypes are less likely to promote cooperation.

Individuals are often overly pessimistic about out-group cooperation.

Economic shocks can sharply increase negative stereotyping.

Abstract

Stereotypes are generalized beliefs about groups of people, which are used to make decisions and judgments about them. Although such heuristics can be useful when decisions must be made quickly, or when information is lacking, they can also serve as the basis for prejudice and discrimination. In this paper we study the evolution of stereotypes through group reciprocity. We characterize the warmth of a stereotype as the willingness to cooperate with an individual based solely on the identity of the group they belong to. We show that when stereotypes are coarse, such group reciprocity is less likely to evolve, and stereotypes tend to be negative. We also show that, even when stereotypes are broadly positive, individuals are often overly pessimistic about the willingness of those they stereotype to cooperate. We then show that the tendency for stereotyping itself to evolve is driven by the costs of cognition, so that more people are stereotyped with greater coarseness as costs increase. Finally we show that extrinsic "shocks", in which the benefits of cooperation are suddenly reduced, can cause stereotype warmth and judgement bias to turn sharply negative, consistent with the view that economic and other crises are drivers of out-group animosity.