Investors got a reminder on Tuesday of the potential for China's currency moves to jar financial markets.<br />European stocks fell with emerging markets after the People's Bank of China reduced the yuan's reference rate by the most in six weeks.<br />The boost in demand for haven assets is a sign that China still has the capacity to disrupt the relative calm in markets that led to a rebound in commodities and stocks in the past week.<br />BHP Billiton's first lowering in its payout in 15 years and a surprise loss posted by Standard Chartered Plc show how the global slowdown and tumbling prices for metals and oil are weighing on earnings.<br />The Stoxx Europe 600 Index lost 0.3 percent at 7:20 a.m. in New York, paring losses of as much as 1.1 percent.