2 expensive mistakes most retirees make — and how to avoid them

2 expensive mistakes most retirees make — and how to avoid them
- April 16, 2026
- John Duffy, economics, shares expertise with MarketWatch
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When it comes to retirement, many individuals make two costly mistakes: They claim Social Security early, even though it reduces the benefit they could receive by waiting; and they spend less than they can afford. “They are unwilling to depart with their wealth,” said John Duffy, an economics professor at the University of California, Irvine. Duffy and Yue Li … co-authored a new study, “Early Social Security Claiming and Slow Asset Decumulation: Experimental Evidence.“ And that behavior, Duffy told me, runs counter to the rational-actor model economists typically rely on.
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