Echo Chambers: Voter-to-Voter Communication and Political Competition

I investigate, in a model of informative campaign advertising, how the ability of voters to strategically communicate with each other shapes the advertising strategies of two competing parties. Two main results are put forward. First, information does not travel among voters biased toward different parties even if they are ideologically close â âecho chambersâ arise endogenously. Second, whenever the probability of interaction among like-minded voters is low (low homophily), parties tailor their advertising on their opponentâs supporters rather than on swing or core states voters.