Introduction. Mergers and Merger Policy in the United States: An Overview. Evaluating Merger Outcomes. Guide to Merger Analysis Using Difference in Differences. Daniel Greenfield. Merger Retrospectives: Two Studies. Mergers and Product Prices. Merger Policy and Remedies. Merger Remedies, Structural and Conduct. Retrospective Studies of Groups of Mergers. Summary of Findings and Concluding. Observations