Unless the rising stock market suddenly slams into reverse, a pattern for U.S. blue-chips that has held for 130 years is about to end. For the past 13 times that a year has ended in seven, going back to 1887, the Dow Jones Industrial Average or its predecessor has suffered a sharp downturn between August and November. The average drawdown has been a little over 13% according to the research firm Leuthold Group.

Source: Wall Street Journal October 18, 2017 00:22 UTC