(Adds New York dateline, U.S. trading, updates prices)
* Stocks drop as China boosts bank reserve mandate
* Dollar index hits 7-mth high; Greece concerns dent euro
* Oil falls 3 pct to below $74 a barrel
By Jessica Mortimer and Al Yoon
LONDON/NEW YORK, Feb 12 (Reuters) - World stocks slumped and the dollar jumped to a seven-month high on Friday after China surprised markets by tightening monetary policy with higher bank reserve requirements.
China increased the reserve level for banks by 50 basis points on the eve of its New Year's holiday in a move aimed at slowing lending and tempering inflation. For details, see [
]Global markets were rattled by fears that China's tightened monetary policy will potentially dampen global growth. Worries over Greece's debt problems and signs of slow growth in Europe continued to sting the euro.
"As we look here in the United States to cut back on some of the stimulus, we're almost counting on other nations to continue to provide the same level of demand," said Rick Meckler, president of investment firm LibertyView Capital Management in New York.
"Seeing China possibly cut back at the same time is raising concerns about whether or not we can come out of this with the same level of demand."
World stocks reversed earlier gains, with the MSCI world equity index <.MIWD00000PUS> falling 0.6 percent. U.S. stocks dropped, with the Dow Jones industrial average <
> off 129.24 points, or 1.27 percent, to 10,014.95. The Standard & Poor's 500 Index <.SPX> lost 12.12 points, or 1.12 percent, to 1,066.35. The Nasdaq Composite Index < > dropped 19.01 points, or 0.87 percent, to 2,158.40.In Europe, the FTSEurofirst 300 <
>> declined 0.5 percent at 984.87, led lower by banks and mining stocks. Prior to China's move, the index had risen as much as 1 percent and looked set to extend a winning run into a fifth day."The rise in banks' reserve requirements reduces the leverage of the Chinese to buy, and China are big buyers of raw materials, so this has weighed heavily on mining stocks," said Mic Mills, senior trader at ETX Capital.
Commodities fell, with crude oil futures <CLc1> off 2.8 percent to $73.20 per barrel, and spot gold prices <XAU=> down $13.35, or 1.22 percent, to $1081.60. The Reuters/Jefferies CRB Index <.CRB> lost 1.4 percent.
The dollar <.DXY> gained 0.5 percent against a basket of currencies, as investors sought the safety of the U.S. currency. The dollar hit a high of 80.552 after earlier reaching its best level since July 2009, as investors sought the safety of the U.S. currency.
The euro slid to a near nine-month low against the dollar at $1.3533 <EUR=>, as the China news came on top of concerns about the lack of any detailed plan to rescue debt-ladened Greece and anemic euro zone economic growth. In New York, the euro <EUR=> was down 0.78 percent at $1.3574, and the dollar rose 0.27 percent to 89.96 yen <JPY=>.
The European Union sent a "clear message of solidarity" with Greece on Thursday, tempering fears of a broader crisis in the euro zone bloc, but investors were nervous that other euro zone countries may run into similar trouble. [
]Economic data sparked concerns the region's economic recovery may be starting to falter, with euro zone gross domestic product expanding a meager 0.1 percent in the fourth quarter. [
]The next focus for the market in the European fiscal saga is meetings early next week between EU finance ministers. Meanwhile, analysts said, markets are likely to remain jittery.
"Until we get more details on a political solution for Greece, the euro is going to stay under selling pressure," said Kasper Kirkegaard, currency analyst at Danske Bank in Copenhagen.
Traders bid U.S. Treasuries higher after the eurozone GDP report and amid uncertainty over details of the EU plan for Greece. A break in issuance of U.S. debt next week also buoyed prices.
Prices were little changed after U.S. retail sales for January topped forecasts. Retail sales grew by 0.5 percent, compared with a consensus estimate of 0.3 percent. Also, U.S. consumer confidence slipped in February. [
]Yields on the benchmark 10-year Treasury note declined 0.05 percentage point to 3.68 percent. Bund futures <FGBLc1> rose. (Additional reporting by Naomi Tajitsu and Jessica Mortimer in London, and Leah Schnurr and Emily Flitter in New York; editing by Jeffrey Benkoe)