During the short span of a few months in 2008, 14 trillion dollars of highly rated bonds fell into junk status, surprising the global financial system and accelerating an economic decline. The result was the worst fracture of the US financial system since the Great Depression. Credit rating...

Prisoner's dilemmas can lead rational people to interact in ways that lead to persistent inefficiencies. These dilemmas create a problem for institutional designers to solve: devise institutions that realign individual incentives to achieve collectively rational outcomes. I will argue that we do...