How is this different?Mathew Ingram / @mathewi: .@mollywood @fmanjoo: retailers set the price for all kinds of things, based on demand ??? why not books?Dan Gillmor / @dangillmor: @mollywood seems to me we need more competition ??? marketplaces, not collusion in agency pricing @fmanjooKim Harrison / @burningbunnies: Best argument I have seen yet to date. <a href="http://fb.me/...Neil">http://fb.me/...Neil</a> Irwin / @neil_irwin: Key