We study how a behavior (an idea, buying a product, having a disease, adopting a cultural fad or a technology) spreads among agents in an a social network that exhibits segregation or homophily (the tendency of agents to associate with others similar to themselves). Individuals are distinguished...

We study the impact of considering the incentives of candidates to strategically affect the outcome of a voting procedure. First we show that every non-dictatorial voting procedure that satisfies unanimity, is open to strategic entry or exit by candidates: there necessarily exists some candidate...