One of his interests concerns designing policies for the exchange of goods about which people have strong ethical intuitions, for example, with living organ donation or when incentive systems place a price on the natural environment. In another line of research, he studies what policies help people make good financial decisions. He addresses these questions using a combination of controlled experiments and economic theory. His research has been featured in the popular press, including the Washington Post, the Financial Times, and the Frankfurter Allgemeine Zeitung.