So, to me, it's quite obvious that there's lot a whole of inefficiency in our economy. The idea of "perfect information" in our economy is not real, but an artificial condition that could never be reached.
If you think about it, uncertainty is everywhere. People lust after certainty all the time. Think about how many economic predictions that were wrong like off 1 percents or 2. Think about the economists who tell people that the housing boom is going to last. Think about the fortune tellers.
That to me, tell that information can never be perfect, because there wouldn't be tons of people who offer services predicting something, who nonetheless get it wrong anyway.
And that why patio sometime talk of economic inefficiency as a kind of Nirvana for entrepreneurs, because there are ton of opportunities.