[chii]

> Insufficient knowledge

and whenever there's a knowledge gap, the "market" exploits it for arbitrage. But eventually (which may be a long time), this exploit would stop working as more people try to exploit it causing the profits from it to go down, or the lack of knowledge for which this exploits exist starts to disappear.

There's no rule to say that the market is super efficient at all times - just that it tends towards efficiency.

[stainforth]

We can and should regulate the "market" when they exploit ignorance of our fellow beings, regardless to the degree of efficiency you purport it has.

[pc86]

Why is "market" in quotes, do you mean it ironically or are you quoting another comment?

Seriously, though - we do. But regulations take time to catch up. As they should.