[abhorrence]

The way most of these companies are colluding now is by using third party firms that "aggregate industry salary information". So basically company X provides their data, pays some dollars, and get access to what other companies in their "peer set" are paying for different types of levels/experience. Reminds me a lot of the schemes companies will sometimes use to do bribes in other countries -- paying a third party consultancy who they had "no possible way of knowing that they were actually just bribing people".