Stocks for the Long Run? Setting the Record Straight
Editor’s Note: This is the final article in a three-part series that challenges the conventional wisdom that stocks always outperform bonds over the long term and that a negative correlation between bonds and stocks leads to effective diversification. In it, Edward McQuarrie draws from his research analyzing US stock and bond records dating back to 1792. CFA Institute Research and Policy Center recently hosted a panel discussion comprising McQuarrie, Rob Arnott, Elroy Dimson, Roger Ibbotson, and Jeremy Siegel. Laurence B. Siegel moderated and Marg Franklin, CFA, president and CEO of CFA Institute introduced the debate. Edward McQuarrie: In my first two blog posts, I reviewed the new historical findings presented in my Financial Analysts Journal paper. Relative to when Jeremy Siegel first formulated the Stocks for the Long Run thesis 30 years ago, better and more complete information on 19th century US stock and bond returns has emerged. Likewise, courtesy of the work of Dimson and others, a far richer and more complete understanding of international returns is now in hand. I summarized the new historical findings in my paper’s title: “Stocks for the Long Run? Sometimes Yes, Sometimes No.” In this concluding post, I will highlight the implications of these new findings for investors today. I will address several misconceptions that I’ve encountered interacting with readers of the paper. Misconception #1: McQuarrie doubts whether stocks are a good investment over the long term. Nope. Rather, I want you to adjust your expectations for the long-term wealth accumulation that you can expect from holding stocks, especially a 100% stock portfolio, over your idiosyncratic personal time horizon. Here’s why I think some adjustment of expectations is necessary. Let me first acknowledge that no author is responsible for what readers do with their work once published and diffused, so what follows is not a criticism of Siegel or his research. That said, some readers of Siegel’s Stocks for the Long Run conclude: “If I can hold for decades, stocks are a sure thing, a no-lose proposition. It could be a wild ride over the short-term, but not over the long-term, where buying and holding a broad stock index essentially guarantees a strong return.” Siegel never said any such thing. But I can assure you, more than a few investors drew the conclusion that for holding periods of 20 years or more, stocks are like certificates of deposits with above-market interest rates. The inference that my paper attempts to refute is that stocks somehow cease to be a risky investment once they are held for decades. I presented numerous cases where investors in other nations had lost money in stocks over holding periods of 20 years or more. And to make the demonstration more compelling, I first excluded war-torn nations and periods. My point is: Stocks are NOT guaranteed to make you money over the long term. In fact, stocks have often rewarded investors over the long term, despite large fluctuations in the short term. Patient investors have reaped huge rewards, especially US investors fortunate enough to be active during the “American Century.” Over the 20 years from the end of 1948 to the end of 1968, an investment in US stocks would have turned $10,000 into almost $170,000. Over the 18 years from the end of 1981, that investment would have turned $10,000 into almost $175,000 And over the 36 years from 1922 to 1958, that investment would have turned $10,000 into almost $340,000, despite the, ahem, hiccup that occurred after 1929. Huge rewards can be reaped from stocks. But there is no guarantee of any reward. You make a wager when you invest in stocks. It remains a wager when you invest in a broadly diversified index such as the S&P 500. And it is still a bet even when you hold it for 20 years. Odds are good that your bet will pay, especially if you are investing in a globally dominant nation, such as the US in the 20th century, or the UK in the 19th century. But the odds never approach 100%. Misconception #2: McQuarrie wants me to own more bonds. It would be more correct to say that I wish to rehabilitate bonds from the disrepute in which they fell after their terrible, horrible, no good, very bad performance in the decades from 1946 to 1981. Those years dominated the record in the Stocks, Bonds, Bills & Inflation yearbook compiled by Roger Ibbotson and colleagues when Siegel first formulated his thesis. The new historical record reveals that the divergent performance of stocks and bonds from 1946 to1981 was unique. Nothing like it had ever occurred in the century-and-a-half before. The most recent four decades look quite different, with stock and bond performance again approximating parity. Here is where it becomes important to tread very carefully in constructing a forward-looking interpretation of the historical record with respect to the equity premium, i.e., the advantage of owning stocks instead of bonds. If you calculate the mean or average stock performance relative to bond performance over the entire two-century US record, you get an equity premium of about 300 to 400 bp annualized. That’s huge. Compound that for 20 or 30 years and you’ll find yourself chanting “Stocks for the Long Run.” Outcomes by Century Stocks Bonds Equity premium Inflation Mean Wealth Mean Wealth Mean Mean 19th century: 1800 – 1899 6.68% (12.71) $322 6.98%a (9.21) $594 -0.29%a (10.37%) -0.27%a (5.17) 20th century: 1900 – 1999 8.85%b (19.65) $837 2.32%a,b (10.35) $6 6.54%a (18.79%) 3.17%a (5.04) Note. Reproduced from “Stocks for the Long Run? Sometimes Yes, Sometimes No.” Arithmetic mean of real total returns. Wealth is the value of $1.00 invested for 100 years (compounded returns can be extracted by taking the 100th root). Equity premium is the mean of the annual subtractions. Standard deviations are in parentheses. Means with superscript a are different across periods and those with superscript b are different within period (t-tests with heterogenous variance, all p-values < .01). If you separate out
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