An ominous stock market measure is at its most dangerous level in 70 years — here are 7 ways traders

The Leuthold Group has developed a five-part methodology for assessing how much upside the stock market has at any given time. The firm's latest findings show that this measure is at its most extended level in more than 70 years. Leuthold offers seven recommendations for what investors can do to get ahead of any subsequent market meltdown. It takes more than one big development to crush a bull market. But what happens when five areas become problematic? Well, that's when things start...