According to a study done in Canada, there is a positive correlation between the amount of P2P sharing done by a person (Canadian, anyway) and the amount of CDs that that person buys. This is according to:
In my opinion, this is an exceptionally important find, the results of which strike a firm blow against the music industry. This proves that FREE p2p sharing can actually have a POSITIVE influence on a revenue-driven market, thus serving to legitimize p2p as something good. It proves a level of responsibility on the part of consumers.
In short, it means that free is not necessarily bad. It's a good thing to look further into as a possible solution to end the Piracy War.