Wal-Mart helps Wall Street to new records, but techs curb gains

Wal-Mart jumped more than 4 percent to a two-year high of $84.46 after forecasting U.S. online sales would rise by about 40 percent in the next fiscal year and unveiling a $20 billion share buyback plan. Investors are also focused on the third-quarter earnings season, which starts in earnest later this week, as they look to see if corporate profits justify the stocks' lofty valuations.

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