(2 minutes to read) In investing, one lesson matters more than almost any other: you can’t buy past returns—you can only earn future returns. Yet many people do exactly the opposite. They chase what did well recently, believing strong performance will continue. History shows this mistake can be extremely expensive.
Nobel Prize–winning research explains why. Studies by economists such as Eugene Fama show that markets quickly absorb new information. When an investment has already done well, much of the good news is already reflected in its price. Robert Shiller has shown that excitement and stories can push prices far above reasonable levels—setting investors up for disappointment.
A painful example is the dot-com bubble of the late 1990s. Investors piled into technology stocks simply because they had gone up. When the bubble burst, many portfolios were cut in half or worse. Some people had to delay retirement for years. Others never fully recovered. The damage wasn’t just financial—it changed life plans.
This pattern repeats because people tend to buy after prices rise and sell after prices fall. The data show that this behavior results in lower returns than simply staying invested. Taxes, trading costs, and bad timing all add up.
A better approach comes from Nobel-recognized research on diversification, led by Harry Markowitz. Long-term success doesn’t come from guessing what’s hot—it comes from discipline.
The best way to pursue future returns is simple:
- Diversify broadly
- Keep costs and taxes low
- Stick to a long-term plan
- Rebalance instead of chasing trends
Chasing past returns can be exciting—but history shows it can be very costly.
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