Holding everything else constant, government approval of horizontal mergers is more likely to be granted if the "market" that firms are in are broadly defined rather than narrowly defined.

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Quizplus · Accepted Answer

This is because in a broadly defined market, there are likely to be more firms and more competition, which may make it easier for merging firms to argue that the merger will not harm competition. In contrast, in a narrowly defined market, there are likely to be fewer firms and less competition, which may make it easier for the government to argue that the merger will harm competition.

Holding Everything Else Constant, Government Approval of Horizontal Mergers Is