I tried to think of an antitrust pun but nothing worked. ("DT doesn't trust the feds on Martians!" Ugh.) Anyway, here is the piece that got him fired from Cato. I have held all sorts of crazy views over the years, so I certainly don't think any less of Armentano for writing this. In fact, since he knows how crazy it sounds, I really respect him.
But it probably helps that he's retired from teaching and presumably can afford to get fired.
CORRECTION: Gene is right, upon further review, it was wrong for me to use the verb "fired." I think I picked that up from the LRC blogger where I stole this from. (Cosmic justice, I guess: I hadn't given a hat tip because I forgot, and so now I won't mention the person who misled me.) And just to clarify, I am not condemning Cato's decision necessarily. The point of my blog post was to praise Armentano for writing something that would make people roll their eyes.