Belief that stock prices are poised for take-off is unfounded

US STOCK prices have made little headway in more than 13 years, and the cumulative real returns generated by the major market averages have lagged treasury bonds by a substantial margin over the period.

The uber-bulls are confident, however, that the more than decade-long stagnation has led to attractive valuations that should pave the way for strong returns in the years ahead, and some investment practitioners have gone as far as to predict a doubling in equity values by 2022. Is the optimism justified?

It is important to appreciate the three sources of real stock market returns – dividend yield, real growth in earnings-per-share, and changes in valuation. Since 1871, US stocks have delivered annualised real returns of 6.5 per cent, of which more than 70 per cent is attributable to the dividend yield, roughly one-quarter to real growth in earnings-per-share, and the remainder to an increase in the valuation multiple attached to current per share profits.

Looking forward, future returns seem virtually certain to fall short of the historical experience simply because the dividend yield is little more than 2 per cent today or less than half its long-term mean. The uber-bulls will undoubtedly argue that the dividend yield understates the total payout to shareholders due to the sizable increase in share repurchase activity in recent decades.

However, share buybacks are already included in per-share numbers, and adjusting the payout ratio upwards would be double-counting. A shareholder can either participate in the buyback and miss out on the earnings-per-share accretion or forego the cash distribution and benefit from the capital gain. Thus, forecasting returns on a per-share requires no adjustment to the dividend yield.

The second building block in estimating future returns is the real growth in earnings-per-share linked to the economy’s long-term growth rate. However, existing shareholders have a claim on publicly-quoted per-share earnings and not economy-wide profits.

Initial public offerings and secondary issues account for a considerable portion of the growth in aggregate earnings through time and, as a result, the growth in per-share numbers falls well short of the cumulative increase in total profits. Indeed, real earnings-per-share have increased at an annual rate of just 1.7 per cent since 1871, or roughly half the pace of economic growth.

The optimists put forward a variety of reasons as to why earnings-per-share growth will be higher in the future but none stands up to serious scrutiny. It is argued that share repurchases will provide a boost to earnings, which conveniently ignores the fact that the reduction in share count through time is largely a myth. New share issuance in excess of buybacks has averaged 1.25 per cent a year over the past half-century, and repurchases have exceeded new issuance in just eight years.