An anonymous reader writes: File sharing of music has been part of the Internet landscape for well over a decade, but the debate over its economic impact continues to rage. The issue has come to fore once again in recent weeks after Columbia University's American Assembly released an excerpt of a report that found that peer-to-peer users purchase 31 percent more downloads than non-P2P users. Michael Geist now reports that the RIAA's response — through the NPD Group — contained basic math errors as it double counted sales data and significantly understated the spending difference between P2P users and non-P2P users.
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