Orley Ashenfelter, Daniel Hosken, Matthew Weinberg, Apr 30, 2009
The challenge of effective merger enforcement is tremendous. U.S. antitrust agencies must, by statute, quickly forecast the competitive effects of mergers that occur in virtually every sector of the economy to determine if mergers can proceed. Surprisingly, given the complexity of the regulators task, there is remarkably little empirical evidence on the effects of mergers to guide regulators. This paper describes the need for retrospective analysis of past mergers in building an empirical basis for antitrust enforcement, and provides guidance on the key measurement issues researchers confront in estimating the price effects of mergers. We also describe how evidence from merger retrospectives can be used to evaluate the economic models that predict the competitive effects of mergers.
Featured News
EU Regulators Escalate Pressure on US Tech Giants
May 3, 2026 by
CPI
Spirit Airlines Ceases Operations After Rescue Talks With White House Collapse
May 3, 2026 by
CPI
Pentagon Taps Seven AI Firms for Classified Networks
May 3, 2026 by
CPI
Subscribers Sue to Challenge Proposed Paramount-Skydance and Warner Bros. Merger
May 3, 2026 by
CPI
US Antitrust Authorities Complete Review of Intel’s SambaNova Investment
May 3, 2026 by
CPI
Antitrust Mix by CPI
Antitrust Chronicle® – Unilateral Effects
Apr 28, 2026 by
CPI
A Net Present Value Approach to Merger Analysis
Apr 28, 2026 by
Joseph J Simons & Malcolm Coate
Generative AI and Competitive Disruption: Increasingly Relevant for Merger Analysis?
Apr 28, 2026 by
Andrea Coscelli, Emily Chissell, Nitika Bagaria & Tega Akati-Udi
Non-Price Unilateral Effects In Media Mergers
Apr 28, 2026 by
Lapo Filistrucchi & Teresa Oriani
Ecosystem Mergers and Unilateral Effects? A Framework for Assessing the Ecosystem Theory of Harm
Apr 28, 2026 by
Ethel Fonseca, George Tucker & Helder Vasconcelos