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Why tiny gaps near round numbers drive big decisions. Milkman explores why a used car with 99,500 miles sells for dramatically less than one with 100,500 miles — and what this reveals about how our minds process numbers.
Canon
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Milkman observes that round-number goals (save $100K, run a 4-minute mile, lose 20 pounds) provide brief satisfaction before the next round-number goal takes over. Achievement resets to the new baseline.
Highlights
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Round-number effects reveal how the brain simplifies complex information through categorical thinking
Milkman presents research showing that crossing round-number thresholds triggers categorical shifts in perception. 99,500 miles feels categorically different from 100,500 miles, even though the difference is trivial.