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A group of agents with ex-ante independent and identically uncertain
quality compete for a prize, awarded by a principal. Agents
may possess evidence about the quality of those they share a social
connection with (neighbours), and themselves. In one equilibrium,
adversarial disclosure of evidence leads the principal to statistically
discriminate between agents based on their number of neighbours
(degree). We identify parameter values for which an agent’s exante
winning probability is monotone in degree. All equilibria that
satisfy some robustness criteria lie between this adversarial disclosure
equilibrium and a less informative one that features no
snitching and no discrimination.
