> If there is a town of 8k rental apartments and I own 4k and you own 2k ...
You can't make policy this way. There is no such market anywhere in America, where 2 players own a majority share. In the case that I cited there is only 1 RealPage client in the city and they manage 100 of 30k homes.
There isn't, it's to illustrate a point. If it's collusion when two players control everything and agree to to raise prices on the phone, why isn't it collusion when it's 300 players and there's a website that they're doing it on?