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A comment on Markets are Efficient if and Only if P = NP. Parent comment

Re:Markets are Efficient if and Only if P = NP by gwern on Wednesday August 17, 2011 @12:15PM (#2895826)
> If I start using my knowledge that P = NP to trade I will not have enough capital to swing the market to truly reflect the efficient price.

How long would it take you to gain enough capital to start moving prices? If you have a systematic edge on all trades...

In any event, I didn't find OP interesting the first time and I don't know. Most people aren't using OP's extremely strong definition of efficient market, but merely saying that humans and current algorithms cannot over long periods extract money; it's a statement about the market vs other actors, not markets versus omniscient gods.

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Re:Markets are Efficient if and Only if P = NP by kragen on Wednesday August 17, 2011 @11:13PM (#2897824)
Results like general equilibrium are conditional on the OP's extremely strong definition of efficient market. Whether or not you personally can get rich by beating the market is not the only possible interesting question about economics!
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