The Dow Jones Industrial Average closed 159.72 points lower, or 0.6% at 26,935.07. The S&P 500 pulled back 0.5% to 2,992.09. The Nasdaq Composite dropped 0.8%.The Dow and Nasdaq fell 1.1% and 0.7%. The S&P 500 lost 0.5% this week. High volatility is more than just a coincidence – a critical period for many investors that manage performance. Stock volatility has been 25% higher on average.