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* Stocks extend rally: Shanghai composite index up 8 pct
* Treasuries rise, US stock futures dip as questions linger
* Signs of stabilisation in overnight lending among banks
By Kevin Plumberg
HONG KONG, Sept 22 (Reuters) - Asian stocks rose more than 2 percent on Monday, as investors chased bargains after details emerged about a U.S. government $700 billion bank bailout plan, increasing hopes the worst of the financial crisis may be over.
However, the U.S. dollar eased and U.S. Treasury debt prices edged up, with market participants playing it safe before the mechanics of the plan are worked out with Congress.
Willingness among investors to take more risk for higher returns slowly returned, after news surfaced on Friday of what is likely the biggest bailout in U.S. history, capping an historic week in which Lehman Brothers filed for bankruptcy, Washington rescued American International Group and Bank of American bought Merrill Lynch.
Many aspects of the U.S. plan have yet to be thrashed out and tensions have already arisen over Congressional efforts to curb the executive pay of program participants. However, in Asia, where stock markets had fallen 17 percent in September prior to the bailout plan, the devil was apparently not in the detail.
"The larger-than-expected U.S. rescue package is definitely positive, and it seems Congress will approve the plan given the dire situation financial markets are facing," said Kang Hyun-cheol, a market analyst at Woori Investment & Securities in Seoul.
"Investors' attention is likely to shift from financial markets to the real economy, mainly key economic data and corporate earnings," Kang added.
Japan's Nikkei share average <
> was up 2.5 percent, after hitting a 3-year low last week. The index has rebounded 8 percent in two days.South Korea's KOSPI <
> rose 1 percent, led by shares of POSCO <005490.KS>, the world's fourth-largest steelmaker, and the Shanghai composite index < > leapt 8 percent as investors jumped back in to what had been the world's worst performing market.HOW EFFECTIVE WILL PLAN BE?
The bailout plan would add to U.S. taxpayers' burden after the effective nationalisation of Fannie Mae and Freddie Mac earlier this month and would weigh on the U.S. fiscal position, putting the world's largest debtor even more in the hole.
As a result, U.S. S&P 500 index futures <SPc1> were down 1 percent. That was on the heels of Friday's massive rally in stocks worldwide -- the largest ever one-day advance as measured by market value. The MSCI main world equity index <.MIWD00000PUS> added more than $1.5 trillion in value on the day.
The U.S. dollar fell against the yen and the euro, as dealers awaited further details of the bailout plan.
The dollar fell 0.6 percent to 106.84 yen <JPY=>, while the euro rose 0.2 percent to $1.4495 <EUR=>.
"The market has come out of a near panic stage after the U.S. government plan," said Tohru Sasaki, chief forex strategist at JPMorgan Chase Bank in Tokyo.
"But we're still far from being able to say the problems are solved as we don't know yet how effective the newly created U.S. facility will be. The market looks set to remain unstable for a while."
The 10-year U.S. Treasury note yield <US10YT=RR>, which moves in the opposite direction to the price, slipped to 3.77 percent after jumping nearly 30 basis points on Friday.
The short-end of the market reflected slightly reduced demand for very short-term liquidity, with yields on 3-month and 6-month bills above 1 percent after dropping to near zero last week as investors bailed out of money market funds.
Also, overnight U.S. dollar borrowing rates were around 2 percent on Monday, bang on the federal funds rate. During the most dire days of the crisis, the rate rose to 6 percent in the Asian session and had hit 10 percent at one point during the European session.
The October U.S. light crude contract <CLc1> was largely unchanged at $104.50 a barrel. Crude earlier slipped $1 after Nigeria's main militant group began a unilateral ceasefire.
Spot gold <XAU=> fell 1.2 percent to $861.90 an ounce.