Social Learning with Endogenous Information and the Countervailing Effects of Homophily

2026-01-31

AI Summary

This study investigates how homophily in social networks endogenously shapes information quality and diversity, thereby influencing individual learning outcomes. By developing a network model that integrates game theory, information economics, and social learning theory, the paper uncovers an endogenous trade-off: while homophily enhances information quality, it may simultaneously suppress the volume of information generated. The central finding is that the effect of homophily on learning is non-monotonic and moderated by network structure—facilitating learning in dense networks but hindering it in sparse ones. This result offers a novel mechanism and theoretical perspective for understanding how social network architecture shapes information diffusion and collective learning.

Technology Category

• Game Theory and Economic Paradigms: Imperfect Information
• Data Mining & Knowledge Management: Graph Mining, Social Network Analysis & Community
• Cognitive Modeling & Cognitive Systems: Social Cognition And Interaction

Application Category

• Social Networks and Social Media: Influence propagation, information diffusion, and the prediction on networks
• Economics, Online Markets and Human Computation: Social networks and social learning
• Web Mining and Content Analysis: Content-based information diffusion

Abstract

People learn about opportunities and actions by observing the experiences of their friends. We model how homophily -- the tendency to associate with similar others -- affects both the endogenous quality and diversity of the information accessible to decision makers. Homophily provides higher-quality information, since observing the payoffs of another person is more informative the more similar that person is to the decision maker. However, homophily can lead people to take actions that generate less information. We show how network connectivity influences the tradeoff between the endogenous quantity and quality of information. Although homophily hampers learning in sparse networks, it enhances learning in sufficiently dense networks.

Problem

• social learning
• homophily
• endogenous information
• network connectivity
• information quality

Innovation

• social learning
• homophily
• endogenous information
• network connectivity
• information quality