At the end of the day, November 20, the Dow Jones Industrial Average (DJI) was down 445 points.
In a market that has experienced significant volatility, generally due to a lack of trading volume, Thursday was marked by unusually heavy volume. Needless to say, this was predominantly sellers; many of the stocks I follow had volumes that were 15-30% above their average day. I suspect this is due mostly to institutions trying to raise capital, in any way possible, and mutual funds selling shares as customers withdraw funds. Other news from around the world follows:
Citigroup (C) loses half its value in 3 days: Financial Times
Is the crisis is over for Canada's banks? Globe and Mail
Is it time to go long on stocks? Economist
US deflation, the Fed's new challenge: Financial Times
Bank and hedge fund selling driving volatility: Economist
Swiss central bank cuts rate 1.0%: Financial Times
Potential takeover targets: Globe and Mail
No auto bailout GM, F, Chrysler: New York Times
General Motors Financial (GMAC) wants bank bailout: New York Times
BASF Chemical closing 80 plants: New York Times
Iceland gets IMF bailout, re-floats currency: Financial Times
Are we headed for 1930's-style deflation? Economist
"Citigroup's problems run deep:" Economist

Mutual funds have record outflow in Oct., reverse in Nov.: Barrons

Five stocks with significant cash reserves: Barrons
Is Japan's lost decade our future? Globe and Mail
How low can the Dow go? It's anybody's guess. However, a chart of the Nikkei, left, since 1980 is instructive as to what is possible. Other bear markets in the 20th century had the following impact on the Dow: 1929-32: -89.2%; 1937-38: -49.3%; 1940-42: -32.7%; 1961-62: -27.1%; 1973-75: -45.1%. And recently, T. Rowe Price compiled some data on this topic: since 1945, recessions lasted on average 10 months; from the market peak to the bear market low, the S&P 500 large cap stocks fell an average of 23.6% (we have already exceeded this); and the market usually begins rising half way through a recession with the S&P 500 up 24% on average six months after the market started rising.