What did the Dalbar study titled 'Quantitative Analysis of Investor Behavior' conclude about average investors?

• A. They fail to achieve market-index returns.
• B. They consistently beat market-index returns.
• C. They never invest in stocks.
• D. They always diversify perfectly.

Answer: (A)

Investors’ behavior has a big effect on the actual returns they realize. The Dalbar study looks at the real money people put into equity funds and the returns those investments actually earned, then compares that to a market index over long periods. It finds that the average investor underperforms the index because emotions and biases drive actions—buying after prices have risen, selling after declines, chasing last year’s winners, and holding cash during downturns. This poor timing and cash drag means the realized returns fall short of simply mirroring the market. So the takeaway is that the typical investor does not achieve market-index returns, even though the market itself can be matched by a straightforward, passive approach.