What preferences will prevail in a society of rational individuals when preference evolution is driven by their success in terms of resulting payoffs? We show that when individuals’ preferences are their private information, a convex combinations of selfishness and morality stand out as...

We analyze the effects of family ties on the incentives for production of effort, where family ties are defined as a mixture of true and coerced altruism between family members. We model families as pairs of siblings. Each sibling exerts effort in order to obtain output under uncertainty. A...

We analyze how family ties affect incentives, with focus on the strategic interaction between two mutually altruistic siblings. The siblings exert effort to produce output under uncertainty, and they may transfer output to each other. With equally altruistic siblings, their equilibrium effort is...

How can a desire to cooperate in one-shot interactions survive, even though it gives a material disadvantage to its carrier? I analyze this issue using a one-shot public goods game between two altruistic individuals. Within a pair, the least altruistic individual is better off materially....

A principal requires a manager for production. He can use an internal manager, or contracts with an external manger. In each case, the manager obtains experience benefits from production. When the principal uses an internal manager, both parties share cost information. When the principal...

Accordingto Hamilton’s(1964a, b) rule,a cost lyaction will be undertaken if its fitness cost to the actor falls short of the discounted benefit to the recipient,where the discount factor is Wright’s index of relatedness between the two. We propose a generalization of this rule,and show that...