The only other time that the Shiller P/E ratio was this high was just before the dotcom bust. Investors shouldn't panic, but they should be aware of the historically high Shiller P/E ratio. Knowing ...

In July, the Shiller P/E ratio hit 40.91, the highest it's been since August 2000. In the past, when the Shiller P/E ratio has spiked to unusually high levels, a market crash has followed. What should ...