1. Should market definition play a prominent role in the analysis of horizontal mergers? What facts would make market definition more important or less important to a particular case? 2. How should market concentration indicators such as HHI be used in merger analysis today? What is HHI or market concentration capable of telling us about a market? What is HHI or market concentration capable of telling us about the competitive effects of a particular merger? What is HHI or market concentration not capable of telling us? 3. Discuss your opinions on the 2010 Horizontal Merger Guidelines' approach to weighing potential efficiencies against potential competitive harm. Does the Guidelines' approach evince a preference for either Type I or Type II error