I don't know, I've been putting some thoughts to this

Uptick rule, and naked shorts.... One thing.... that violates supply and demand..... If you can sell more shares than exist, in a stock. ... seems like maybe that is unhealthy..

One problem in the 30's was uptick, and if the financials can't raise capital, because more of their shares have been sold than exist. all because they may cut a dividend... which then progressed into the maddness that every bank in the coutry was going to fail.

but this does imperril the options, and the ETF's.... There could be some segnificant changes.

I would bet that the skf or the options it trades in....will have a hard time with this