We ruined antitrust enforcement in the 70s and 80s by switching from “we know companies having too much of a market is bad, so that’s enough” to “we must show s

We ruined antitrust enforcement in the 70s and 80s by switching from “we know companies having too much of a market is bad, so that’s enough” to “we must show specific harm of specific kinds before we can do anything”. This is like requiring overwhelming evidence that a radiation source caused a particular case of cancer—not other problems, like birth defects, just cancer, and we’re gonna assume the cancer wasn’t caused by the radiation source until you can convince us otherwise—before being able to move against an actor exposing the public to radiation.