Business

Stocks edge up as leaders pledge to save euro

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Stocks edged higher as investors awaited the unofficial start of earnings season, led by the aluminum giant Alcoa. After markets closed, though, the company posted a loss of $191 million, or 18 cents a share; price pressures took their toll. Still, stocks got a lift as European leaders, led by Merkel and Sarkozy, renewed their commitment to shore up the euro.