Findings in behavioral science, including psychology, have been influencing policies and reforms in many nations. “Choice architecture” can affect outcomes even if material incentives are not involved. In some contexts, default rules, simplification, and uses of social norms have been found...

There has been a great deal of discussion of the welfare effects of digital goods, including social media. The discussion bears on both private practice and potential regulation. A pilot experiment, designed to monetize the benefits of Facebook use, found a massive disparity between willingness...

Prediction markets are markets for contracts that yield payments based on the outcome of an uncertain future event, such as a presidential election. Using these markets as forecasting tools could substantially improve decision making in the private and public sectors. We argue that U.S....

It is increasingly clear that the world would be better off with an international agreement to control greenhouse gas emissions. What remains poorly understood is that the likely costs and benefits of emissions controls are highly variable across nations. Most important, prominent projection...

The concept of quot;irreversibilityquot; plays a large role in the theory and practice of environmental protection. Indeed, the concept is explicit in some statements of the Precautionary Principle. But the idea of irreversibility remains poorly defined. Because time is linear, any loss is, in a...

If one nation damages another, what are its obligations? This question can be approached and understood in diverse ways, but it is concretized in debates over the social cost of carbon, which is sometimes described as the linchpin of national climate policy. The social cost of carbon, meant to...