U.S. Stocks Fall as Drugmaker Selloff Ends Lull Before Yellen

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  • Drug price hikes draw lawmaker criticism, spooking investors
  • Health-care shares fall the most since June Brexit vote

A selloff in drugmakers dragged U.S. stocks lower, a jolt to markets that had been in a holding pattern before a speech Friday from Federal Reserve Chair Janet Yellen that may provide clues on when to expect higher borrowing costs.

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