Spreading of intolerance under economic stress: results from a model with reputation

TL;DR

This paper models how economic stress can lead to the emergence of intolerance within minorities through reputation-based cooperation dynamics, highlighting conditions for tolerance restoration.

Contribution

It introduces a model where labels and reputation influence moral and action rules, demonstrating how intolerance can develop under economic stress.

Findings

Intolerance can emerge in minority groups under economic stress.

Reputation-based models predict a correlation between economic conditions and tolerance levels.

Conditions for restoring tolerance are identified.

Abstract

When a population is engaged in successive prisoner's dilemmas, indirect reciprocity through reputation fosters cooperation through the emergence of moral and action rules. A simplified model has recently been proposed where individuals choose between helping or not others, and are judged good or bad for it by the rest of the population. The reputation so acquired will condition future actions. In this model, eight strategies (referred to as 'leading eight') enforce a high level of cooperation, generate high payoffs and are therefore resistant to invasions by other strategies. Here we show that, by assigning each individual one out of two labels that peers can distinguish (e.g., political ideas, religion, skin colour...) and allowing moral and action rules to depend on the label, intolerant behaviours can emerge within minorities under sufficient economic stress. We analyse the sets of conditions where this can happen and also discuss the circumstances under which tolerance can be restored. Our results agree with empirical observations that correlate intolerance and economic stress, and predict a correlation between the degree of tolerance of a population and its composition and ethical stance.