As investors reacted to this strong 'buy' signal for stocks in exporters, the Nikkei 225 surged more than 2% in early trading, and looked set to challenge 10,600 before profit-taking pared it back to 10,432.17, a rise of 108.82. Signs from Germany that the European economy is reviving also boosted stocks such as Sony, which added as much as 3% at one time, while Canon, which relies heavily on exports, bounced up more than 6%.