Cass R. Sunstein, professor of law at the University of Chicago Law School, will deliver the first Distinguished Lecture of the new AEI Center for Regulatory and Market Studies. His subject will be the sources of extremism. He uses recent studies of juries, federal judges, and ordinary citizens to show that groups of like-minded people often move to extreme positions on many questions, including climate change, labor policy, same-sex relations, and affirmative action. This general phenomenon --ideological amplification -- helps to explain many things, including punitive damage awards, excessive and insufficient regulation, oppositional movements, political correctness, ethnic conflict, and even terrorism. He will also discuss how cost-benefit analysis, for example, can be used to solve such behavior.