Antitrust Division of the US Department of Justice

In the last two years, the Federal Trade Commission (FTC) and the Antitrust Division of the US Department of Justice (DOJ) brought, and won, several litigated merger cases by establishing narrow markets comprised of a subset of customers for a product. This narrow market theory, known as price discrimination market definition, allowed the agencies to allege markets in which the merging parties faced few rivals and, therefore, estimate high post-merger market shares.

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