MBrichacek writes "The Journal of Political Economy is running the results of a study into P2P file-sharing, reports Ars Technica. The study has found that, contrary to the claims of the recording industry, there is almost no effect on sales from file-sharing. Using data from several months in 2002, the researchers came to the conclusion that P2P 'affected no more than 0.7% of sales in that timeframe.' 803 million CDs were sold in 2002, according to the study, which was a decrease of about 80 million from the previous year. While the RIAA has been blaming that drop (and the drop in subsequent years) on piracy, given the volume of file-sharing that year the impact from file sharing could not have been more than 6 million albums total. Thus, 74 million unsold CDs from that year are 'without an excuse for sitting on shelves.'"