[short_sells_poo]

That is entirely up to the broker. They make no guarantees to you that they'll underwrite your risk taking with no limits. If you don't want this to happen, go to a reputable broker and make sure you are not trading on margin. This is not rocket science, but does require a basic level of understanding.

[captainarab]

I agree that this is the technically correct definition of how margin is typically utilized, and that investors should be prepared for this in the case of high volatility.

The fact does remain, though, that the way the data is presenting itself seems to indicate that there was disingenuous behavior on the behalf of market makers and a number of hedge funds. To be seen, I guess.

[jrochkind1]

I mean, assuming manipulative self-interested disingenuous behavior on the part of market makers and hedge funds on a daily basis is usually a safe bet. Also on the part of nearly anyone interacting with the stock market who has the power to do it. It's kind of the whole game. True, that may not be how they teach it to you in high school.