Ring Out, Wild Bells

Short History of Financial Euphoria, Galbraith quote

On Friday December 6th, the U.S. stock market pushed to the most extreme level of valuation in U.S. history, based on the measures that we find best-correlated with actual subsequent 10-12 year S&P 500 total returns, as well as the depth of subsequent losses over the completion of market cycles across a century of data. That’s not a forecast. Rather, it’s a statement about current, measurable, observable market conditions.

While we’ve seen an initial retreat based on concern that the Federal Reserve may lower interest rates less aggressively than hoped, record valuations leave the market vulnerable to a hundred risks, not just one. Presently, our most reliable valuation measures exceed those observed at the 1929 and 2000 peaks, and I continue to view the period since early-2022 as the extended peak of the third great speculative bubble in U.S. history.

The chart below shows our most reliable gauge of market valuations in data since 1928: the ratio of nonfinancial market capitalization to gross value-added (MarketCap/GVA). Gross value-added is the sum of corporate revenues generated incrementally at each stage of production, so MarketCap/GVA might be reasonably be viewed as an economy-wide, apples-to-apples price/revenue multiple for U.S. nonfinancial corporations.

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The chart below shows the relationship between MarketCap/GVA and actual subsequent 12-year S&P 500 average annual total returns, in data since 1928.

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Importantly, the current valuation extreme is by no means restricted to a single measure. The chart below shows our Margin-Adjusted P/E, which considers cyclical variations in profit margins and their impact on the price/earnings ratio, along with the ratio of the S&P 500 to the present value of actual subsequent S&P 500 dividends at every point in time since 1900, discounted at a constant rate of 10% annually (see chart text for additional details). The ratio therefore estimates the extent to which likely long-term S&P 500 total returns are likely to depart from a 10% average return. The higher the valuation, the larger the expected shortfall from historically run-of-the-mill expected returns of 10%.

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It’s tempting to imagine that our valuation perspective relies on the assumption that current profit margins are unsustainable. Yet even if one takes average profit margins over the past decade at face value (as the Shiller cyclically-adjusted P/E does), and even if one takes Wall Street’s unprecedented expectations for year-ahead profit margins as the basis for market valuation (as the S&P 500 forward operating P/E does), market valuations are presently at levels observed only surrounding the 2000 and 2022 market peaks. Indeed, given the fairly linear relationship between the forward operating P/E and the Shiller CAPE, we can get a good sense of what the forward operating P/E would have looked like on a historical basis, had data on this measure been available. Presently, valuations are easily above the 1929 extreme even on these measures.

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