We devise an experiment to explore optimal contracts in a hidden-information context. A principal offers one of three possible contract menus to a team of two agents of unknown skill levels, with both agents' participation needed for production. We observe numerous rejections of the more...

Self-control problems have recently received considerable attention from economic theorists. We conducted two studies involving behavioral interventions expected to affect performance, providing some of the first experimental data in this area. In the first we investigate whether evenly spaced...

Evidence suggests that whether or not people dislike lying is situation-dependent. We argue that the theory of simple guilt can accommodate this well.

We propose a new organizing scheme for classifying types of experiments. In addition to the standard categories of laboratory and field experiments, we suggest a new category: “extra-laboratory experiments.” These are experiments that have the same spirit as laboratory experiments, but are...

We investigate the nature of continuous time strategic interaction in public-goods games. In one set of treatments, four subjects make contribution decisions in continuous time during a 10-min interval while in another they make them only at 10 discrete points of time during this interval. The...

In this article we explore the issues that surround within-subject and between-subject designs. We describe experiments in economics and in psychology that make comparisons using either of these designs (or both) that sometimes yield the same results and sometimes do not. The overall goal is to...

Are men more willing to take financial risks than women? The answer to this question has immediate relevance for many economic issues. We assemble the data from 15 sets of experiments with one simple underlying investment game. Most of these experiments were not designed to investigate gender...

Economists and psychologists have developed a variety of experimental methodologies to elicit and assess individual risk attitudes. Choosing which to utilize, however, is largely dependent on the question one wants to answer, as well as the characteristics of the sample population. The goal of...

We test a mechanism whereby groups are formed voluntarily, through the use of voting. These groups play a public-goods game, where efficiency increases with group size (up to a limit, in one treatment). It is feasible to exclude group members, to exit one's group, or to form larger groups...