We develop a dynamic network formation model that can explain the observed nestedness in real-world networks. Links are …

I develop a model of group decision-making, in which a committee generates proposals and holds open discussions, but … the ultimate decision is either taken by a leader (decision by authority) or by majority vote. Optimal communication … that by favouring one particular agent — the leader — authoritative decision-making reduces rent-seeking discussions and …

The phenomenon of choice shifts in group decision-making is fairly ubiquitous in the social psychology literature …. Faced with a choice between a ‘safe’ and ‘risky’ decision, group members appear to move to one extreme or the other … situations. This Paper demonstrates that from an individual decision-making perspective, choice shifts may be viewed as a …