(CNN) — U.S. stocks were poised to fall sharply at Tuesday’s open as a selloff in global markets rattled confidence. Dow Jones industrial average (INDU), S&P 500 (SPX) and Nasdaq (COMP) futures were down about 2%. Futures measure current index values against perceived future performance and offer an indication of how markets may open when trading begins in New York. Lower global markets have created “a feedback loop of concern,” said Mark Luschini, chief investment strategist at Janney Montgomery Scott.

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