I'm pretty sure it's the same rule that outlaws insider trading. If the analysts and investment bankers talked to each other they could potentially cook up som

I'm pretty sure it's the same rule that outlaws insider trading. If the analysts and investment bankers talked to each other they could potentially cook up some crazy schemes: "Hey Joe, I just invested someone's money in company X. Can you upgrade them to a BUY rating?" "Sure thing Bill, what's my cut?" "10% of the increase?" "Sure, sounds fair." Or another scheme: "Hey Joe, GM is a big client and is starting to get a little worried about TESLA. Can you downgrade them?" "Sure thing Bill, let's put Elon in his place and keep our big clients happy."