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Major central banks around the globe took coordinated action Wednesday to ease the strains on the world's financial system, saying they would make it easier for banks to get dollars if they need them. Stock markets and the euro rose sharply on the move.

The worst week for the stock market in two months ended with a whimper in thin trading Friday. The Dow Jones industrial average lost 4.8 percent this week, while the broader Standard & Poor’s 500 index fell 4.7 percent. Both had their worst weeks since Sept. 23.

Viacom said it is voluntarily transferring its stock-exchange listing to the Nasdaq Global Market, from the New York Stock Exchange, as Nasdaq successfully lured away one of the biggest media companies from the Big Board.

U.S. stock futures are back up near Wednesday's opening price this morning as investors continue to focus firmly on Italy. Yesterday the Dow dropped almost 400 points as Italian bond yields surged past the 7% mark that is seen as the point of no return. At a time when the country has a lot of debt to refinance, borrowing costs are seen as unsustainable.

The Dow Jones industrial average was down 200 points just before midday Wednesday after Italy's borrowing costs soared, a sign that Europe's debt crisis had spilled into the third-largest economy in the euro bloc.

Groupon, the company that pioneered online group discounts, saw its stock climb by nearly a third in its public debut Friday, showing strong demand for an Internet company whose business model is considered unsustainable by some analysts. Groupon's stock jumped $6.40, or 32 percent, to $26.40 in late morning Friday after trading began at about 10:45 a.m. Earlier, the stock was trading as high as $31.14. Big fluctuations are common for companies that have just gone public as investors gauge what to do with the stock. The stock is trading on the Nasdaq Stock Market under the ticker symbol "GRPN."

SecondMarket has raised money from a venture fund started by a former Facebook executive as the online marketplace for private shares looks to persuade more companies to sign up.

The Dow Jones industrial average closed up 339 points Thursday after European leaders unveiled a financial rescue plan and the data showed the U.S. economy growing at a faster clip in the third quarter than earlier in the year.

Two companies with quirky names, Ubiquiti Networks and Zeltiq Aesthetics, made their public debuts earlier this month with listings on the Nasdaq Stock Market. Each company's stock went up modestly on the first day of trading.

Wall Street celebrated Columbus Day with a 330-point buying binge on the Dow as traders around the world breathed a sigh of relief that European leaders pledged to bolster their banks and the markets look ahead to the start of earnings season.