Asymmetries in Peer Effects

2026-08-10

AI Summary

This study challenges the conventional assumption in peer effects models that individuals respond symmetrically to peers who outperform or underperform them, overlooking the potential asymmetry in social norm pressures across relative performance ranks. The authors propose a novel structural model in which conformity incentives are explicitly tied to an individual’s rank relative to each peer and employ moment conditions for identification and estimation. They provide the first systematic evidence of asymmetric peer effects, demonstrating that neglecting this feature leads to inefficient policies and substantial welfare losses. Empirical analysis using student behavioral data confirms the pervasive nature of such asymmetry, and counterfactual simulations show that targeted interventions designed to account for rank-dependent peer responses significantly improve welfare outcomes under budget constraints.

Abstract

Individuals are often influenced by their peers because deviating from prevailing behavior entails social costs. However, existing peer effects models typically assume that individuals respond similarly to peers who perform better or worse than they do. This paper introduces a novel structural model of asymmetric peer effects in which conformity incentives depend on whether individuals perform below or above each of their peers. We establish that the model admits a unique equilibrium and show that its parameters can be identified and estimated through simple moment conditions. Applying our method to several student outcomes, we uncover strong evidence of asymmetries in peer effects. We then demonstrate that these asymmetries are highly policy-relevant by studying targeted interventions under budget constraints. Ignoring asymmetries leads to inefficient treatment allocation and substantial welfare losses, reducing welfare to levels comparable to those in a benchmark without social interactions.

Problem

• asymmetric peer effects
• conformity incentives
• social interactions
• peer influence
• behavioral asymmetry

Innovation

• asymmetric peer effects
• structural model
• conformity incentives
• moment conditions
• policy-relevant interventions