Markets are suddenly tumbling all around the world, right as Twitter is going public

North American stocks have been sliding all morning. The S&P 500 index is down 0.6%, trading at 1760, 14 points off the highs of the morning. The Dow Jones Industrial Average is down 0.2%, but the NASDAQ is the big lagger, down 1.0%. The index is being dragged lower by QUALCOMM (down 3.8%), Whole Foods (down 8.9%), and Tesla (down 7.5%), which all missed expectations on earnings this week. And after a boost earlier, European indices are now giving up gains. The Italian FTSE MIB is down 1.6%, and the…

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