The Long-Term Case for Equities
From 1802 through 2024, a period spanning the Industrial Revolution, two World Wars, the Great Depression, the Cold War, the dot-com bubble, the global financial crisis, and a pandemic, one dollar invested in a diversified portfolio of U.S. stocks grew to approximately $2.3 million in real, inflation-adjusted terms. The same dollar invested in long-term government bonds grew to approximately $1,900. In gold, to approximately $90. In cash, to approximately $250.
These numbers, compiled and updated regularly by Jeremy Siegel in his work on long-run stock returns, represent the most important fact in investing: equities have outperformed every other major asset class over every sufficiently long time period, in every major market, across every conceivable set of economic conditions. The long-term case for equities is not a prediction. It is a description of what has actually happened, supported by economic logic that explains why it happened and why it should continue.
The Historical Record
The U.S. stock market has returned approximately 6.5% to 7.0% per year in real terms since 1802 and approximately 7.0% since 1926 (the period covered by the more detailed CRSP database). This real return has been remarkably stable across very different economic eras.
1802-1870: Real equity return approximately 7.0% per year. This period encompassed the War of 1812, the Civil War, massive territorial expansion, and the transition from an agrarian to an industrial economy.
1871-1925: Real equity return approximately 6.6% per year. This period included the Panic of 1893, the Panic of 1907, World War I, and the Spanish Flu pandemic.
1926-2024: Real equity return approximately 7.0% per year. This period included the Great Depression (stocks lost 89% from peak to trough), World War II, the stagflationary 1970s, the dot-com bubble, the 2008 financial crisis, and the COVID-19 pandemic.
The stability of this real return across dramatically different economic regimes suggests that equity returns are driven by fundamental economic forces rather than by the specific conditions of any particular era.
Internationally, the evidence is similarly compelling, though with more variation. Dimson, Marsh, and Staunton's analysis of 35 countries from 1900 to 2024 shows that equities outperformed bonds in every country over the full period. The global equity risk premium (stocks minus bonds) has averaged approximately 3.5% to 4.5% per year across all markets. Countries that experienced extreme disruptions, such as Germany (two World Wars, hyperinflation), Japan (wartime destruction, postwar miracle, 34-year bear market), and Russia (communist revolution, total market loss), show the widest variations, but even they demonstrate long-term equity outperformance in the periods following reconstruction.
The Economic Logic
The long-term superiority of equity returns is not a statistical coincidence. It is the predictable consequence of what stocks represent: fractional ownership of businesses operating within growing economies.
Economies grow. Global GDP has increased in real terms in the vast majority of years since the Industrial Revolution. Population growth, productivity gains, and technological advancement drive economic expansion. As long as human societies continue to innovate, trade, and produce, the total output of goods and services will grow.
Corporate earnings track economic growth. Businesses sell goods and services to the economy. When the economy grows, aggregate corporate revenues and earnings grow with it. This relationship is not one-for-one (corporate profit margins fluctuate with competitive dynamics, regulation, and labor costs), but the long-term correlation between GDP growth and earnings growth is strong and positive.
Stock prices follow earnings. Over periods of ten years or more, stock price growth closely tracks earnings per share growth plus the dividend yield. If a company grows earnings at 8% per year and pays a 2% dividend yield, the expected total return is approximately 10%. Short-term prices are driven by sentiment, speculation, and momentum. Long-term prices are driven by the cash flows the business generates.
The equity risk premium is compensation for genuine risk. Stockholders accept the possibility of permanent capital loss in exchange for a proportional claim on business profits. Bondholders accept a fixed return in exchange for legal priority in bankruptcy. The difference in expected returns (the equity risk premium) compensates stockholders for bearing the risk that bondholders avoid. As long as stocks are riskier than bonds, investors will demand higher expected returns, and the premium will persist.
This chain of logic, growing economies produce growing corporate earnings, growing earnings produce growing stock prices, and the additional risk of equity ownership is compensated by additional return, is the foundation of the long-term case for equities. It requires no prediction about the next quarter, the next year, or even the next decade. It requires only the continuation of economic growth, which has been the default state of human civilization for centuries.
Why the Future Should Resemble the Past
Skeptics argue that past performance is no guarantee of future results, and they are technically correct. The equity risk premium could compress, economic growth could stall, or structural changes could reduce corporate profitability. These risks deserve examination.
Could economic growth stop? Global population growth is slowing, which reduces one tailwind. But productivity growth, driven by technological innovation, has historically been the larger contributor to economic expansion. The introduction of artificial intelligence, advances in biotechnology, and improvements in energy production suggest that productivity growth will continue for the foreseeable future. Economic growth may slow from historical averages, but outright stagnation would require a reversal of human progress without historical precedent.
Could corporate profitability decline? Corporate profit margins in the U.S. have been above their long-term average since 2010, driven by technology sector dominance, globalization, and low interest rates. A reversion to mean margins would reduce earnings growth. However, even at historically average margins, earnings would continue to grow in line with revenue growth, which tracks nominal GDP. Lower margins reduce the rate of return but do not eliminate the equity premium.
Could the equity risk premium compress? If investors become more risk-tolerant, they might bid up stock prices to levels where expected returns are lower. The elevated valuations of the 2020s (S&P 500 CAPE ratio above 30, compared to a historical average of 17) suggest this may already be happening. A lower starting valuation would have been better for future returns, and the elevated starting point likely means the next 10 to 20 years will deliver below-average real returns. However, "below average" for equities still likely exceeds bond and cash returns.
The most honest forecast is that long-term real equity returns will probably be modestly lower than the historical 7% average, perhaps 4% to 6% annually for the next 20 years, due to elevated starting valuations. This is still substantially higher than the expected real return on bonds (1% to 2%) or cash (0% to 1%). The relative case for equities remains intact even if the absolute level of returns moderates.
The Power of Earnings Reinvestment
Corporate earnings that are not paid as dividends are reinvested into the business. If a company earns a 15% return on equity and reinvests all earnings, book value grows at 15% per year. Over time, the stock price reflects this compounding of retained earnings.
Berkshire Hathaway has never paid a dividend. Every dollar of earnings has been reinvested at high rates of return. The result: book value per share grew from $19.46 in 1965 to over $400,000 by 2024, a compound annual growth rate of approximately 19.8%. The stock price followed, turning a $1,000 investment in 1965 into over $40 million.
This earnings reinvestment mechanism is unique to equities. Bonds pay a fixed coupon and return principal; there is no reinvestment of returns into the bond itself. Cash generates interest but does not compound at increasing rates. Only equity ownership provides a claim on retained earnings that compound within the business, generating returns on returns without any action by the investor.
The Equity Premium Across Market Cycles
The equity risk premium has persisted through every major market crisis, not despite the crises but because of them. Crises are the mechanism that generates the premium. If stocks never crashed, they would be priced like bonds, and the excess return would disappear.
After the 1929-1932 crash, when stocks lost 89% of their value, the real return on equities over the subsequent 10 years was approximately 9% per year. After the 1973-1974 bear market, when stocks fell 48%, the subsequent 10-year real return was approximately 9.5%. After the 2008-2009 crash, when stocks fell 57%, the subsequent 10-year real return was approximately 11.5%.
The pattern is clear: the equity premium is largest when it is least psychologically accessible. At the moment of maximum fear, when equities appear most dangerous, expected future returns are highest. This is not a timing strategy; no one can reliably identify the bottom. It is a structural observation about how risk and return interact. The premium exists because the pain of holding stocks through crashes is real, intense, and sufficient to drive many investors out of the market, leaving the rewards for those who remain.
What This Means for Investors
The long-term case for equities does not mean that stocks will go up every year, every decade, or even every two decades (though they have in the U.S.). It means that the expected real return on a diversified equity portfolio is higher than that of any other major asset class over periods of 15 years or more, and that this premium is earned by bearing the genuine risk of short-term losses.
For an investor with a 30-year time horizon, the practical implication is that equities should constitute the majority of the portfolio, typically 70% to 90%. The exact allocation depends on risk tolerance and financial circumstances, but the case for a heavy equity tilt at long horizons is as strong as any conclusion in financial economics.
For an investor with a 5-year time horizon, the case is far less clear. Stocks can and do decline by 40% or more over 5-year periods. The equity premium exists in expectation, not in every realization. Short-horizon investors should hold more bonds and cash, accepting lower expected returns in exchange for lower probability of loss.
The long-term case for equities is not a call to recklessness. It is a call to patience. The premium is earned over decades, not months. The investor who stays invested through 40 years of market cycles, contributing regularly, rebalancing periodically, and resisting the urge to sell during panics, will almost certainly be rewarded. The historical record says so. The economic logic explains why. The only variable is the investor's discipline.
Put these principles into practice. Track fundamentals, build portfolios, and analyze stocks with AI-powered insights.
Start Free on GridOasis →