Current Stock Market Overvaluation According to CAPE And Q Metrics
Erik McCurdy | Apr 02, 2013 03:09AM ET
During the past two months, the large basket of fundamental, technical, internal and sentiment data that our computer models use to calculate our Andrew Smithers out of London provides yet another metric based on Tobin’s q (market value versus replacement cost). The chart below is on log scale, so you have to do a bit of math to translate to percentage over/undervaluation, for example, exp(0.42) = 1.52, or 52% overvaluation. The chart is based on data through the end of 2012. Smithers notes “At that date the S&P 500 was at 1426 and US non-financials were overvalued by 44% according to q and quoted shares, including financials, were overvalued by 52% according to CAPE. With the S&P 500 at 1552 the overvaluation was 57% for non-financials and 65% for quoted shares.”
Unfortunately, that seems about right. Let’s translate this into an estimate of prospective 10-year total returns, assuming underlying nominal economic growth rate of about 6.3% (which may be optimistic, but is a robust peak-to-peak norm across economic cycles, and is unlikely to be pessimistic), and a dividend yield of about 2.2% on the S&P 500. With that, a 65% overvaluation in quoted shares, reverting to fair valuation a decade from now, would imply a 10-year annual nominal total return on the S&P 500 of 1.063*(1/1.65)^(1/10) + .022 – 1 = 3.3% annually. That’s right in line with the estimates we obtain from a wide range of other historically reliable approaches (historically reliable in italics, because the “Fed Model” is not).
Notice that in 1982, the -0.7 reading on Smithers’ log-scale chart implied that stocks were undervalued by exp(-0.7)-1 = -50%. At that point, with the dividend yield on the S&P 500 about 6.7%, one would have estimated a 10-year prospective total return for the S&P 500 of 1.063*(1/0.5)^(1/10)+.067 – 1 = 20.6% annually. One would have been correct.
In contrast, note that in 2000, the 1.0 reading implied that stocks were overvalued by exp(1.0)-1 = 172%. At that point, with the dividend yield on the S&P 500 at just 1.2%, one would have estimated a 10-year prospective total return for the S&P 500 of 1.063*(1/2.72)^(1/10)+.012 = -2.6% annually. Again, one would have been correct.
Not only are all of these distinct valuation methods quite accurate historically, but we can also fully explain their divergence from simplistic forward earnings approaches, using decades of data on corporate profits, government deficits, and household saving, spanning from the 1940’s to the present. This evidence hammers down two points: corporate profit margins are nearly 70% above their historical norm precisely because of the spectacular combined deficit of government and households, as the deficit of one sector must emerge as the surplus of another; and every bit of historical evidence indicates that elevations in corporate profits are mean reverting, being followed by negative or significantly below-average earnings growth over subsequent years. See Two Myths and a Legend to review the historical evidence in this regard.
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