Saturday marks the 10th anniversary of the longest bull market in history, however global slowdown fears are creating serious questions over whether the record run can continue.

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U.S. markets are on track for their worst week of 2019, so far, amid deepening worries across the globe. In China, February data showed exports collapsed 20.7% from a year ago. In Europe, new stimulus measures were announces to prop up the faltering economy. And in the U.S., February’s weaker-than-expected employment report sparked a debate over future jobs growth.