The development of the welfare state in the Western economies between 1930 and 1990 coincided with a puzzling pattern in the taxation of top incomes. Effective tax rates at the top increased sharply but then gradually decreased, even as social transfers continued rising. We propose a new theory...

We illustrate the contrast between two sources of intergenerational disagreement when generations are overlapping and governments aggregate preferences in a utilitarian manner. Social preferences tend to exhibit a present-bias because generations are imperfectly altruistic about future...