This Slashdot post, for some reason, made me stop for a moment and consider consumer rationalism, and the fact that entire arguments for free markets are being undermined by advances in psychological study. How can you sustain a market supposedly guided (in the long term) by consumer choice when a). the market itself conspires to twist this choice in any way possible, and b). it lends itself to conglomeration, and as the larger these companies get, the more power they acquire.
This kind of pretty much confirms further my theory that capitalism and free marketism is a sound idea at first, but it doesn't scale in the real world. There are too many assumptions and idealisms with regard to "human nature". Will have to look into this more.