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We need to stop talking about another roaring 20s for sharemarkets

A lot of comparisons have been made in recent months between the start of the Roaring 1920s and the new decade underway. The similarities are indeed striking. Then, as now, the US was digging out from the public health and economic fallout of a global pandemic even as a wave of new technology was set to transform the country’s political, social and economic landscape.

Those similarities – the Spanish Flu that began in 1918 and the covid-19 pandemic, and mass adoption of electrification and the combustion engine a century ago and the flood of new technology re-ordering life today – have ignited speculation that another Roaring ’20s is underway. That may be true when it comes to technology or the economy. But the Roaring ’20s also featured a booming stock market, and whatever else may be in store this decade, it’s not likely to include a replay of the raging 1920s bull market.

Investors should brace for a tough decade.

Investors should brace for a tough decade.Credit:AP

That’s because there is one critical difference between the start of the 1920s and today: As 1920 came to a close, the US stock market was the cheapest on record – before or since – going back at least 140 years, according to a widely followed valuation measure compiled by Yale professor Robert Shiller. Today’s market, by contrast, has been more expensive only once before.

The measure I’m referring to is the cyclically adjusted price-to-earnings, or CAPE, ratio. It compares the price of the S&P 500 Index (and its precursor before 1926) with average inflation-adjusted earnings over the previous 10 years to smooth out the ups and downs of the business cycle. Since 1881, the CAPE has swung between a low of 4.8 and a high of 44.2. The low was recorded in December 1920, just as the Roaring ’20s were set to begin, and the high near the peak of the dot-com bubble in December 1999. The current CAPE ratio of 37 is the second highest behind the infamous dot-com peak.

Importantly, the CAPE ratio signals nothing about what will happen to stock prices in the near term or what path they will take in the years ahead. So a high CAPE doesn’t indicate or even imply that a correction is coming, and inversely, a low CAPE doesn’t mean stocks are poised to take off. But the CAPE has been a good barometer of the return investors can expect from the stock market over the medium term.


That’s probably not a coincidence. To see why, it’s useful to deconstruct the stock market’s total return into its three components: dividend yield, earnings growth and change in valuation. A lower CAPE ratio usually means stock prices have declined and therefore dividend yields have risen (yields and prices move in opposite directions). Also, the lower the CAPE, the more room valuations have to expand, thereby boosting the return from stocks. Provided that earnings grow at least in line with their long-term average, the lift from higher dividend yields or expanding valuations, or both, is likely to produce an above-average return.

That’s exactly what happened during the Roaring ’20s. With a rock-bottom CAPE ratio when the 1920s began, dividends contributed 6.3 per cent a year during the decade and expanding valuations kicked in an additional 3.3 per cent. Earnings growth added 5.6 per cent, which is roughly in line with their historical average, for a grand total of 15.2 per cent a year. Roaring indeed.

The opposite is also true, though. A high CAPE ratio depresses dividend yields and leaves valuations with more room to contract than expand. That puts the burden on earnings growth, and if earnings stumble, the results are likely to be disappointing. That’s what happened during the 2000s. With a sky-high CAPE as the decade began, dividend yields contributed just 1.7 per cent a year during the decade, while contracting valuations cost investors 3 per cent a year. Unfortunately, earnings disappointed, too, growing by just 0.6 per cent a year. The net result was a loss of 0.7 per cent a year for the S&P 500.

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