why Warren Buffett is so reluctant to call stocks a “BUBBLE”

On a macro basis, quantification doesn’t have to be complicated at all. Below is a chart, starting almost 80 years ago and really quite fundamental in what it says. The chart shows the market value of all publicly traded securities as a percentage of the country’s business–that is, as a percentage of GNP. The ratio has certain limitations in telling you what you need to know. Still, it is probably the best singble measure of where valuations stand at any given moment. And as you can see, nearly two years ago the ratio rose to an unprecedented level. That should have been a very strong warning signal.
Today, this measure is very nearly as high as it was at the peak of the dotcom mania. So you would think that this would naturally serve, in the words of Mr. Buffett, as yet another “very strong warning signal.”

 

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