Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/302563 
Year of Publication: 
2024
Series/Report no.: 
New Working Paper Series No. 345
Publisher: 
University of Chicago Booth School of Business, Stigler Center for the Study of the Economy and the State, Chicago, IL
Abstract: 
We discuss the design of an effective merger review policy for the 21st century. We argue that the practice of the past decades is inadequate and propose a move towards much stronger rebuttable structural presumptions. These presumptions establish that all mergers above certain thresholds are illegal unless the merging parties can prove that merger-specific efficiencies will be shared with consumers and yield tangible welfare gains. These presumptions are grounded on solid economics and also acknowledge the real-world limitations in enforcement resources and information asymmetries between companies and regulators. We outline how to establish such presumptions in practice, defending the implementation of an ex-ante system that selects in advance (rather than per transaction) which companies and markets are subject to the presumption. Finally, we outline which merger-related efficiencies can rebut the presumption.
Document Type: 
Working Paper

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