Make no mistake – this is an equity bubble, and a highly advanced one. On the most historically reliable measures, it is easily beyond 1972 and 1987, beyond 1929 and 2007, and is now within about 15% of the 2000 extreme. The main difference between the current episode and that of 2000 is that the 2000 bubble was strikingly obvious in technology, whereas the present one is diffused across all sectors in a way that makes valuations for most stocks actually worse than in 2000. The median price/revenue ratio of S&P 500 components is already far above the 2000 level, and the average across S&P 500 components is nearly the same as in 2000. The extent of this bubble is also partially obscured by record high profit margins that make P/E ratios on single-year measures seem less extreme (though the forward operating P/E of the S&P 500 is already beyond its 2007 peak even without accounting for margins).
Recall also that the ratio of nonfinancial market capitalization to GDP is presently about 1.35, versus a pre-bubble historical norm of about 0.55 and an extreme at the 2000 peak of 1.54. This measure is better correlated with actual subsequent market returns than nearly any alternative, as Warren Buffett also observed in a 2001 Fortune interview. So if one wishes to use the 2000 bubble peak as an objective, we suggest that it would take another 15% market advance to match that highest valuation extreme in history – a point that was predictably followed by a decade of negative returns for the S&P 500, averaging a nominal total return, including dividends, of just 3.7% annually in the more than 14 years since that peak, and even then only because valuations have again approached those previous bubble extremes. The blue line on the chart below shows market cap / GDP on an inverted left (log) scale, the red line shows the actual subsequent 10-year annual nominal total return of the S&P 500.
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