A perfectly efficient market is nice in theory but I don't think it exists outside of commodities like "sorghum and gypsum" (I think those are tptacek's words).

A perfectly efficient market is nice in theory but I don't think it exists outside of commodities like "sorghum and gypsum" (I think those are tptacek's words). Consumers are usually not going to be perfectly informed so there's always room for marketing to increase the perceived value of a product.