Endowment Effect Examples in Everyday Life: 6 Hidden Ways It Quietly Costs You Money (2026)
In a now-classic Cornell University experiment, students randomly given a $5 coffee mug refused to sell it for less than about $5.25. Students given nothing…
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Recency Bias in Investing: Why Last Year’s Winners Quietly Wreck the Average DIY Portfolio (2026)
Between 2003 and 2023, the average DIY equity fund investor earned about 8.01% a year. The funds they held earned 9.69%. That 1.68 percentage point…
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Overconfidence Bias in Investing: 3 Myths That Quietly Cost You 6%+ a Year
About 64% of U.S. investors say they have a high level of investment knowledge, according to research from FINRA. Roughly 74% of professional fund managers,…
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Mental Accounting and Your Tax Refund: Why $3,462 Feels Like Free Money (and Where It Quietly Goes)
The average federal tax refund this year hit $3,462 — an 11.1% jump over 2025, the largest single-year bump in nearly a decade. And by…
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Confirmation Bias in Investing: Why Smart Research Quietly Sabotages Your Portfolio in 2026
Most investors are told to “do your own research” before buying a stock or fund — and most do exactly that. But there is a…
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Framing Effect Pricing Psychology: 6 Tricks That Make You Overspend
Here is an uncomfortable fact: a sweater priced at $39 can outsell the exact same sweater priced at $34. Researchers at MIT and the University…
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Why Do I Treat Bonus Money Differently? The Mental Accounting Trap That Quietly Costs You Thousands
A $6,000 bonus hits your account and within six weeks it’s gone — a weekend trip, a new TV, a nicer phone. Yet if your…
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How Loss Aversion Affects Budgeting: Why Every Cut Feels Like a Loss (and the Reframe That Fixes It)
A reader emailed me last year about a budget that collapsed in 11 days. She wasn’t broke. She earned $74,000, had no credit card balance,…
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Status Quo Bias and Financial Decisions: How Doing Nothing Quietly Costs You Thousands a Year
A coworker once told me he’d been meaning to move his savings to a higher-yield account “for like two years.” Two years. At the national…
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Gambler’s Fallacy Investing Mistakes: Why “It’s Due to Bounce Back” Quietly Drains Your Portfolio
A few years ago a friend asked me to look at his brokerage account. He’d dumped $4,000 into a single beaten-down stock that had fallen…
