In experimental economics, where subjects participate in different sessions, observations across subjects of a given session might exhibit more correlation than observations across subjects in different sessions. The main goal of this paper is to clarify what are session-effects: what can cause...

We replicate an influential study of monetary incentive effects by Jamal and Sunder (1991) to illustrate the difficulties of drawing causal inferences from a treatment manipulation when other features of the experimental design vary simultaneously. We first show that the Jamal and Sunder (1991)...

Berg et al. (Games and Economic Behavior, 10, pp. 122–142, 1995) study trust and reciprocity in an investment setting. They find significant amounts of trust and reciprocity and conclude that trust is a guiding behavioral instinct (a “primitive†in their terminology). We modify...