Week 7 Day 3: Every 20-Year Period Has Been Positive

If you invested in the S&P 500 at literally the worst possible moment in history and held for 20 years, you still made money. The worst 20-year return was about +54% total. The best was over +2,000%. You do not need to pick the right time. You need to give it enough time.

This statistic is the single most important number in personal finance for long-term investors. It means that if your time horizon is 20+ years, the historical track record shows zero 20-year losing periods. Let that sink in. Not 'most' 20-year periods were positive. ALL of them. This includes investing right before: the Great Depression (1929-1932: -86%), World War II, the 1970s stagflation, the 1987 crash, the dot-com bust (2000-2002: -49%), the Great Financial Crisis (2007-2009: -57%), and the 2020 COVID crash. Every single one of these terrifying events was fully recovered and then some within 20 years. This is why retirement investing works -- and why panicking during a crash is the only way to actually lose money long-term.

The data source for this claim is the Ibbotson SBBI (Stocks, Bonds, Bills, and Inflation) Yearbook, which tracks U.S. large-cap stock returns from 1926 to present. The worst 20-year annualized real return period (1929-1948) was approximately +0.4% annually after inflation -- barely positive but still positive. The average 20-year rolling return is approximately 7% real (inflation-adjusted). It is worth noting several caveats: (1) these statistics apply to U.S. equities, which have been the world's most successful stock market -- not all global markets share this track record (Japan's Nikkei 225 hit an all-time high in 1989 and did not recover for 34 years). (2) Past performance does not guarantee future results -- though the diversified nature of the U.S. economy provides structural reasons for optimism. (3) 'Total return' includes dividends, which are a critical component of the historical positive outcomes.