Key Takeaways A stock market indicator once favored by legendary investor Warren Buffett is hovering around levels that Buffett has previously compared to "playing with fire."The "Buffett Indicator" compares the total value of the U.

Happy days might seem to be here again for many investors. The stock market is doing something it has never done before -- and investors could be "playing with fire," according to Warren Buffett. In July 2001,