Japan's Nikkei 225 stock index has surged 7.7 percent amid strong advances by other Asian markets.
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The Nikkei 225 index closed Wednesday up 1,343.43 points, or 7.7 percent, at 18,770.51.
That was the biggest one-day jump since October 2008.
Investor sentiment has been buoyed by a rebound on Wall Street, hopes for stability in volatile Chinese stocks and expectations for corporate tax cuts in Japan.