Growth Fears Roil Markets – WSJ

U.S. stock futures tumbled, the dollar surged, and Treasury yields again hit their highest levels in over a decade, after investors were jolted by fresh signs of slowing global growth and U.K. plans for big, debt-funded tax cuts. 

Futures tied to the S&P 500, the Dow industrials and the tech-heavy Nasdaq 100 fell between 1.3% and 1.5% before the opening bell Friday, putting the three indexes on track for their fourth consecutive day of declines.