from an interview with Judge Posner on Brian Leiter's blog:
"I've changed my views a lot over the years. I'm much less reactionary
than I used to be. I was opposed to homosexual marriage in my book Sex and Reason,
published in 1992, which was still the dark ages regarding public
opinion of homosexuality. Public opinion changed radically in the years
since. My views have changed about a lot of things. I've become much
more concerned with long prison sentences; softer on drugs; more
concerned with consumer protection, the environment and economic
inequality; less trustful of purely economic analysis—the last partly
because of the crash of 2008 and the ensuing economic downturn. That
shook some of my faith in economic analysis. And developments in
psychology have required qualification of the "rational choice" model of
economic behavior. So my views have changed a lot. You don't want a
judge who takes a position and feels committed to it because he thinks
it's terrible to change one's mind."
Note that he doesn't directly mention antitrust.