David S. Evans is Managing Director of the Global Competition Policy Practice at LECG LLC. Andrei Hagiu is Assistant Professor of Strategy at Harvard Business School. Richard Schmalensee is John C. Head III Dean and Professor of Management and Economics at MIT Sloan School of Management. Evans, Hagiu, and Schmalensee are also with Market Platform Dynamics, a management consulting firm that focuses on strategic analysis and product design for platform-based firms.