The Psychology That Kills Returns
The Behavior Gap
The Behavior Gap
Here is a statistic that should disturb you: investors consistently earn less than the funds they invest in.
The DALBAR Quantitative Analysis of Investor Behavior study tracks this every year. Over the 20 years ending 2023, the S&P 500 returned about 9.7% annually. The average equity fund investor earned approximately 6.0% annually.
That 3.7% gap is not from fees. It is entirely from behavior: buying high, selling low, moving to cash at the wrong time, chasing last year's winners.
Why This Happens
The human brain was not designed for long-term investing. It was designed to respond to immediate threats, follow the crowd (social safety), and avoid pain more than it pursues gain.
These instincts are catastrophic in financial markets:
Loss aversion: Research by Kahneman and Tversky showed that the pain of losing $100 is roughly twice as intense as the pleasure of gaining $100. This makes investors irrationally sensitive to short-term losses.
Recency bias: Whatever just happened feels like it will keep happening. After a crash, the market feels permanently broken. After a bull run, it feels like it will rise forever. Both feelings lead to bad decisions.
Herd behavior: When everyone around you is selling and the news is catastrophic, selling feels rational and holding feels reckless. The opposite is usually true.
The Cost of Missing the Best Days
Missing even a small number of the market's best days is devastating.
For the 20 years ending December 2023, if you held the S&P 500 the entire time:
- $10,000 grew to $64,844 (9.71% annually)
If you missed the 10 best days trying to time the market:
- $10,000 grew to $29,708 (5.61% annually)
If you missed the 30 best days:
- $10,000 grew to $10,051 (0.03% annually)
The best days cluster around the worst periods -- the 10 best single days often occur within weeks of the 10 worst. Investors who flee to cash during crashes miss the recovery.
The Single Best Investing Strategy
Decide on an allocation. Automate contributions. Do not check it obsessively. Do not change course during crashes. Rebalance once a year.
Boring is not a criticism. Boring is the goal.
The financial media is not your ally. Their business model depends on you watching, clicking, and feeling urgency. Markets that calmly trend upward over decades do not generate engagement. Crisis, drama, and expert predictions do. Treat financial news the way you treat weather forecasts: useful for tomorrow, useless for next decade.
According to DALBAR research, why do average investors earn less than the index funds they hold?