Human groups maintain a high level of sociality despite a low level of relatedness among group members. The behavioral basis of this sociality remains in doubt. This paper reviews the evidence for an empirically identifiable form of prosocial behavior in humans, which we call "strong...

Main description: Why do humans, uniquely among animals, cooperate in large numbers to advance projects for the common good? Contrary to the conventional wisdom in biology and economics, this generous and civic-minded behavior is widespread and cannot be explained simply by far-sighted...

We explore the contribution of reciprocity and other non selfish motives to the political viability of the modern welfare state. In the advanced economies, a substantial fraction of total income is regularly transferred from the better off to the less well off, with the approval of the...