Stone bunds in the Ethiopian highlands showed statistically significant and positive impact on yield in low-rainfall areas, but not in high-rainfall areas, and they did not have a statistically…

This study of the deleterious effect on fishing by the water hyacinth invasion of Lake Victoria found an unusual positive: the decline of fish catchability caused by the the abundance of water…

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 yellow floating heart is a water weed causing nuisance problems in Swedish watercourses. An economic analysis of this is required where various management options are considered. The benefits of a…

Land degradation in the form of soil erosion and nutrient depletion presents a threat to food security and sustainability of agricultural production in many developing countries. Governments and…

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…

Empirical evidence suggests that people’s risk-perceptions are often systematically biased. This paper develops a simple framework to analyse public policy when this is the case. Expected utility…