The Dow Theory has a remarkable track record. Ignoring it could be hazardous to your wealth.
“On Monday, the S&P 500 and Dow Jones Industrial Average made history when they closed at all-time highs for the first time in more than a year. Many investors are now expecting a modest rally to ensue, as Brexit worries fade away. But this is not a time to be greedy and jump into a buying frenzy.”
Source: The One Key Indicator Pointing To A Bear Market