计量经济分析 = Econometric analysis

Investor Psychology and Security Market Under- and Overreactions

Investors face numerous challenges when seeking to estimate the prospective performance of a longonly investment in commodity futures. For instance, historically, the average annualized excess retu...

The Strategic and Tactical Value of Commodity Futures

International Momentum Strategies

Neural networks are used in business organizations for providing intelligent decision support. The ABI/Inform bibliographic database has over 1 000 publications on business-related research in neur...

A bibliometric analysis

Two important concepts played a key role in the bull market of the 1990s. Both represent fundamental flaws in logic. Both are demonstrably untrue. First, many investors believed that earnings could grow faster than the macroeconomy. In fact, earnings must grow slower than GDP because the growth of existing enterprises contributes only part of GDP growth; the role of entrepreneurial capitalism, the creation of new enterprises, is a key driver of GDP growth, and it does not contribute to the growth in earnings and dividends of existing enterprises. During the 20th century, growth in stock prices and dividends was 2 percent less than underlying macroeconomic growth. Second, many investors believed that stock buybacks would permit earnings to grow faster than GDP. The important metric is not the volume of buybacks, however, but net buybacks—stock buybacks less new share issuance, whether in existing enterprises or through IPOs. We demonstrate, using two methodologies, that during the 20th century, new share i...

Earnings Growth: The Two Percent Dilution

”Is Your Alpha Big Enough to Cover Its Taxes?“: Reply to Comment

This article examines the performance of large equity mutual funds over the past ten, fifteen, and twenty years. On both a before– and after–tax basis, the authors find that the average mutual fund underperformed the Vanguard Index 500 fund. Although part of this under–performance is attributed to a small–size bias inherent in active management, an analysis of the pure tax effects also shows that funds have not been managed in a tax–efficient manner. The authors suggest a few simple ways to improve after–tax performance.

How Well Have Taxable Investors Been Served in the 1980s and 1990s

We are in an industry that thrives on the expedient of forecasting the future by extrapolating the past. As a consequence, investors have grown accustomed to the idea that stocks "normally" produce an 8% real return and a 5% risk premium over bonds, compounded annually over many decades. Why? Because long-term historical returns have been in this range, with impressive consistency. Because investors see these same long-term historical numbers, year after year, these expectations are now embedded into the collective psyche of the investment community. Both figures are unrealistic from current market levels. Few have acknowledged that an important part of the lofty real returns of the past has stemmed from rising valuation levels and from high dividend yields which have since diminished. As this article will demonstrate, the long-term forward-looking risk premium is nowhere near the 5% of the past; indeed, it may well be near-zero today, perhaps even negative. Credible studies, in the US and overseas, are now challenging this flawed conventional view, in well-researched studies by Claus and Thomas [2001] and Fama and French [2000, Working Paper], to name just two. Similarly, the long-term forward-looking real return from stocks is nowhere near history's 8%. Our argument will show that, barring unprecedented economic growth or unprecedented growth in earnings as a percentage of the economy, real stock returns will probably be roughly 2-4%, similar to bonds. Indeed, even this low real return figure assumes that current near-record valuation levels are "fair," and likely to remain this high in the years ahead. "Reversion to the mean" would push future real returns lower still. Furthermore, if we examine the historical record, neither the 8% real return nor the 5% risk premium for stocks relative to government bonds has ever been a realistic expectation (except from major market bottoms or at times of crisis, such as wartime). Should investors require an 8% real return, or should a 5% risk premium be necessary to induce an investor to bear stock market risk? These returns and risk premiums are so grand that investors should perhaps have bid them away a long time ago - indeed, they may have done so in the immense bull market of 1982-1999. Intuition suggests that investors should not require such outsize returns, and the historical evidence supports this view. This is a topic meriting careful exploration. After all, according to the Ibbotson data, investors earned 8% real returns over the past 75 years, and stocks have outpaced bonds by nearly 5% over the past 75 years. So, why shouldn't investors have expected these returns in the past and why shouldn't they continue to do so? Expressed in a slightly different way, we examine two questions. First, can we derive an objective estimate of what investors should have had good reasons to have expected in the past? And, why should we expect less in the future than we've earned in the past? The answers to both questions lie in the difference between the observed excess return and the prospective risk premium, two fundamentally different concepts that unfortunately carry the same label, "risk premium." If we distinguish between past excess returns and future expected risk premiums, it is not at all unreasonable that the future risk premiums should be different from past excess returns. This is a complex topic, requiring several careful steps to evaluate correctly. To gauge the risk premium for stocks relative to bonds, we need an expected real stock return and an expected real bond return. To gauge the expected real bond return, we need both bond yields and an estimate of expected inflation through history. To gauge the expected real stock return, we need both stock dividend yields and an estimate of expected real dividend growth. Accordingly, we go through each of these steps, in reverse order, to form the building blocks for the final goal: an estimate of the objective, forward-looking equity risk premium, relative to bonds, through history.

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What Risk Premium is 'Normal'?

Factor returns, net of changes in valuation levels, are much lower than recent performance suggests. Value-add can be structural, and thus reliably repeatable, or situational—a product of rising valuations—likely neither sustainable nor repeatable. Many investors are performance chasers who in pushing prices higher create valuation levels that inflate past performance, reduce potential future performance, and amplify the risk of mean reversion to historical valuation norms. We foresee the reasonable probability of a smart beta crash as a consequence of the soaring popularity of factor-tilt strategies.

Robert D. Arnott

Papers

Earnings Growth: The Two Percent Dilution

”Is Your Alpha Big Enough to Cover Its Taxes?“: Reply to Comment

How Well Have Taxable Investors Been Served in the 1980s and 1990s

What Risk Premium is 'Normal'?

How Can 'Smart Beta' Go Horribly Wrong?