We study the determinants of the (steady-state) POUM effect in a model where the individuals evaluate their expected future income using both their current income and observable characteristics such as education, race or gender.

Is truth-value of a statement what lying aversion is all about? We propose an experimental test and find only limited support. In this context with 'bare promises', we also test for guilt aversion and again find only limited support.

The issue of how to best elicit charitable contributions has long been an important one for charitable organizations. Some recent studies have examined different schemes for eliciting contributions for public radio and maximizing revenue for commercial purposes. Our study is a pure field...

We examine gender differences in trust in another party's cooperation (CC) or its ability (AC). While men and women do not differ concerning trust in cooperation, gender has a strong influence when trust in another subject's ability is required.

We show in a public goods experiment on three continents that conditional cooperation is a universal behavioral regularity. Yet, the number of conditional cooperators and the extent of conditional cooperation are much higher in the United States than anywhere else.