I'm saying that if Cuban is correct, the market is closer to efficient than it was before and Wall St. is doing a better job than it used to.

I kind of doubt it. Just in the past decade we've had the tech bubble, the housing bubble, and now this massive correction based mostly on panic.

The market is mostly controlled by greed and fear, as always, and that makes it overshoot in both directions.

Yes, that's how firms on Wall Street make money: they exploit inefficiencies in the market in the short term or long term (and, by the way, by doing so, correct the inefficiencies). Paradoxically, firms that target the shorter term do better when volatility is high, because it usually means there are some pretty massive inefficiencies going on.