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Multi-agent simulation was used to study several styles of leadership in small societies. Populations of 50 and100 agents inhabited a bounded landscape containing a fixed number of food sources. Agents moved about the landscape in search of food, mated, produced offspring, and died either of hunger or at a predetermined maximum age. Leadership models focused on the collection and redistribution...

We formalize the notion of coalition measure as a primitive of social choice with a countably infinite number of agents. An example would be a dynamic setting with an infinite horizon, where it may be convenient to consider separately each individual’s preferences at every moment of time. In this setting, there are some “equal size” coalitions that a social choice rule should treat in the same ...

When is agreement possible? An important aspect of group decision-making is the question of how a group makes a choice when individual preferences may differ. Clearly, when making a single group choice, people cannot all have their “ideal” preferences, i.e, the options that they most desire, if those ideal preferences are different. However, for the sake of agreement, people may be willing to a...