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Antitrust Chronicle® – Market Definition

Antitrust Chronicle® September 2025 Volume 1

Dear Readers, Market definition is perhaps the most important part of any antitrust analysis. It is the necessary starting point in all merger reviews and abuse of dominance cases. Yet its role is increasingly questioned. This CPI Antitrust Chronicle takes a clear-eyed look at those questions. Herbert Hovenkamp opens with a...

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In this issue

Finding Monopoly: Antitrust Market Definition
Herbert Hovenkamp
Sep 17, 2025
Do We Have a Framework for Defining Labor Antitrust Markets? Guidance And Case Studies in the U.S., UK, and EU
Motaz Al-Chanati, Johannes Böken, J. P. Bruno, Elisa Mariscal
Sep 17, 2025
Brick-and-Mortar Transaction Review in the Age of E-Commerce
Elizabeth Suarez, Kara King, Gabriella Small, Ioana-Virginia Motoc, Sam Bellet
Sep 17, 2025
Revisiting the Brown Shoe Indicia for Defining Markets
Roger Blair, Kamal Sodhi
Sep 17, 2025

In case you missed it...



August

This edition of the TechREG Chronicle turns to tokenization — the linking of real-world value to instruments that live on distributed ledgers.




July

The contributions in this Chronicle explore whether existing privacy frameworks remain fit for purpose in an environment characterized by large-scale data collection, increasingly sophisticated identification technologies, and evolving theories of harm.




June

“Buy Now, Pay Later” (“BNPL”) has moved from fintech curiosity to embedded infrastructure in modern consumer markets, quietly reshaping how credit is extended, priced, and experienced. What began as a frictionless alternative to traditional lending now sits at the intersection of payments, consumer protection, and competition policy.


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