U.S. stocks opened little changed on Tuesday as investors remained on the sidelines ahead of the first day of testimony by Federal Reserve Chairwoman Janet Yellen to Congress. Some investors are worried that she may strike a hawkish tone, considering an improving labor market. The S&P 500 opened flat at 2,109. The Dow Jones Industrial Average began the session up 24 points, or 0.1%, at 18,140. The Nasdaq Composite was off by 7 points, or 0.1%, at 4,954.
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