Human motivations and actions are usually muddy, so it ought not be surprising to find that studies on the impact on CD sales of people using P2P networks to cheaply obtain music is unclear. However the Freedom to Tinker Blog offers A Grand Unified Theory of Filesharing that, to me at least, seems plausible. (I would call myself a ‘Sampler’ rather than a ‘Free-rider’.)
Link via Marginal Revolution.