Todd Zywicki, Mercatus Center Senior Scholar and Professor at the George Mason University Law School, discuss the the economics of payment card interchange fees and the limits of regulation. This talk was given at "The Economics and Regulation of Payment Card Interchange Fees" an event co-hosted by the The International Center for Law and Economics and the Mercatus Center at George Mason University held at the Willard InterContinental Hotel on June 9, 2010.