Quantile Peer Effect Models

TL;DR

This paper introduces a flexible quantile-based peer effect model that captures diverse influences across outcome distributions, revealing complex patterns and policy implications in networked populations.

Contribution

It develops a novel structural model for quantile peer effects, establishing existence, uniqueness, and an IV estimation strategy, advancing understanding beyond standard aggregate models.

Findings

Diverse peer influence patterns across outcome quantiles

Key player status depends on outcome distribution, not just network structure

Model uncovers nuanced effects challenging standard assumptions

Abstract

I propose a flexible structural model to estimate peer effects across various quantiles of the peer outcome distribution. The model allows peers with low, intermediate, and high outcomes to exert distinct influences, thereby capturing more nuanced patterns of peer effects than standard approaches that are based on aggregate measures. I establish the existence and uniqueness of the Nash equilibrium and demonstrate that the model parameters can be estimated using a straightforward instrumental variable strategy. Applying the model to a range of outcomes that are commonly studied in the literature, I uncover diverse and rich patterns of peer influences that challenge assumptions inherent in standard models. These findings carry important policy implications: key player status in a network depends not only on network structure, but also on the distribution of outcomes within the population.