We offer a game-theoretic proof of Hamilton's rule for the spread of altruism. For a simple case of siblings, we show that the rule can be derived as the outcome of a one-shot prisoner's dilemma game between siblings.

Quite often established migrants offer assistance and support that facilitate the arrival of new migrants. Why would migrants want other migrants to join them - so much so as to be willing to pay for them to come? We suggest a rationale. Our modeling framework is capable of explaining several...

We model migration as a response to relative deprivation. We present a specific configuration of incomes in which the process of migration in response to relative deprivation reaches a steady state. However, for the general configuration of incomes we show that it is impossible to prove the...

Enabling educated individuals to work abroad entails a brain drain and results in educated unemployment at home. Because the prospect of migration raises the expected returns to higher education it also facilitates a "brain gain": a eveloping economy ends up with a higher fraction of educated...