[mortenjorck]

This has very little to do with monopolies and much more to do with enforcement.

The most persistent misconception about antitrust regulation in the US, and one repeated over and over on HN and in this thread, is that it only applies to businesses in a monopoly position. While the original Sherman Act of 1890 explicitly targeted monopolies, the 1914 Clayton Act expanded its scope to encompass a range of anticompetitive practices, including predatory pricing. [1]

A market actor need not be a monopoly to engage in these behaviors, only a dominant position that they are abusing.

[1] https://www.investopedia.com/terms/c/clayton-antitrust-act.a...