It looks like SEC Chairman Chris Cox still has his job -- this despite John McCain's call to fire Cox. And what has Cox done for us lately? He's banned short selling on 799 financial stocks for the next 10 days, according to the Wall Street Journal [subscription required]. The SEC's temporary ban on short selling won't help deal with the underlying problems causing this 100 Year Crash -- but it won't make them any worse.

Short selling is one way to bet against the decline in a stock's share price. A short seller borrows shares from a broker and sells them at that market price. SEC rules give the short seller three days to obtain custody of those shares. The short seller profits by buying back the shares at a lower market price to repay that stock loan. So-called "naked shorting" -- when the short seller never obtains custody of the shares -- is considered abusive. By banning short selling, the SEC is trying to interrupt a negative feedback loop about which I posted yesterday.

This loop helped shorts profit from a decline in investment bank shares. How so? All the bad news has been driving down their shares so much that ratings agencies downgraded the investment banks' debt. Since that debt was insured through the $62 trillion Credit Default Swap (CDS) market, the downgrade threat boosted CDS premiums requiring the investment bank to post collateral in the billions. This put even more pressure on the investment bank to raise capital, driving down its shares even more.