Antitrust laws start applying long before total market dominance, and one of their goals is to proactively ensure that total market dominance is never reached.

Antitrust laws start applying long before total market dominance, and one of their goals is to proactively ensure that total market dominance is never reached. It certainly can be argued that they have a dominant position in a particular narrow market, and the court will look at these arguments and determine whether they do or not.