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The Google Antitrust Lawsuit:

Initial Observations



October 23, 2020

On October 20, 2020, the Department of Justice and eleven Republican state attorneys general
(hereinafter DOJ) filed a long-anticipated antitrust lawsuit against Google, alleging that the tech giant
has unlawfully monopolized the markets for general internet search services and search advertising. The
complaint follows an investigation of Big Tech platforms that the DOJ launched last summer and
represents the Department's most significant antitrust case since the Microsoft litigation that began over
twenty years ago. The lawsuit also implicates an area of intense congressional interest: earlier this month,
the House Antitrust Subcommittee released a report concluding that major tech companies-including
Google-have   engaged in exclusionary conduct that violates the antitrust laws. This Legal Sidebar
provides an overview of the Justice Department's allegations and offers initial observations on their
relationship to existing antitrust doctrine.


Monopolization Doctrine: The Basics

Section 2 of the Sherman Antitrust Act makes it unlawfulto monopolize commerce. But the statute
does not define that key term, leaving the courts to flesh out its content. In unpacking this language, the
Supreme  Court has explained that the mere possession of monopoly power is not illegal. Instead, a firm
violates Section 2 only if it has monopoly power and engages in exclusionary conduct to achieve,
maintain, or enhance that power.
An antitrust plaintiff typically establishes that a defendant has monopoly power by showing that it has a
dominant market share that is likely to be durable. This process requires parties to define the scope of the
market in which the defendant operates-that is, the denominator in the market-share fraction. Plaintiffs
predictably argue that defendants compete in narrow markets with few rivals, while defendants ordinarily
maintain that they struggle in large markets awash with adversaries. The legal test goes as follows: a
relevant antitrust market consists of the good or service at issue in a given case and all others that are
reasonably interchangeable with it.
In addition to establishing that a defendant has a dominant market share, monopolization plaintiffs
typically must prove that the defendant's dominant position is likely to be durable. Plaintiffs usually try


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