Objectives: To estimate household willingness to pay (WTP) for cholera vaccines in a rural area of Bangladesh, which had participated in a 1985 oral cholera vaccine trial. Methods: A contingent…

The empirical analysis in this paper shows that production risk plays a significant role in sustainable land-management technology adoption in the Ethiopian highlands. The adoption and intensity…

Analysis of the differences in firms’ responsiveness to PROPER (Indonesia’s successful public disclosure program for industrial pollution control) showed that foreign-owned firms and firms in densely…

This artefactual experiment in Ethiopia tested the hyperbolic discounting hypothesis by comparing time discounting over cash and consumption goods, using real payoffs. It found no difference in…

Just how important social context is for voluntary contributions is investigated in a natural field experiment, where subjects made either actual or hypothetical contributions to a national park in…

In a natural field experiment, the authors quantified the importance of anonymity, reciprocity, and conformity through the provision of social reference levels in order to explain voluntary…

The revitalization of Machakos, Kenya, from overpopulation and resource degradation—seemingly by its population growth—has added another round to the Boserupian vs. Malthusian debate, and may make…

The purpose of this paper is to test the absolute as well as the relative importance of these three reasons for non-selfish behavior. This is done by conducting a natural field experiment on voluntary…

We investigate the importance of the social context for people’s voluntary contributions to a national park in Costa Rica, using a natural field experiment. This present paper presents results of a…

This thesis consists of six papers, related to artifactual field experiments, conducted in South Africa. The main focus of the thesis is the effect of different forms of heterogeneity on cooperation…