Mental Accounting: Why a Dollar Is Not Always a Dollar

Page Summary

An explainer of mental accounting, Richard Thaler's finding that people treat money differently depending on subjective categories rather than as fungible, opening with the blizzard-and-basketball-ticket thought experiment. It covers Thaler's framework and its roots in prospect theory, the behavioral life-cycle hypothesis, and earmarking, with four case studies (the house-money effect, credit cards decoupling payment from consumption, tax-refund windfall spending, and the sunk-cost effect), the empirical evidence, and nuances including when mental accounts serve as self-control devices.

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Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.

1. 11 July 2026 · corrected by Emir Baycan

   2 corrections applied: Big Dig overran ~$2.6B to ~$14.6B, a factor of about 5-6, not 9 | Hot/cool system is Metcalfe & Mischel (1999), Psychological Review, not Mischel & Shoda 1995

   Before

   the original Boston Central Artery project by a factor of roughly 9 / particularly his work with Yuichi Shoda published in Psychological Review

   After

   the original Boston Central Artery project by a factor of roughly 5-6 / particularly his work with Janet Metcalfe published in Psychological Review in 1999

   Why: Verified live: both corrections are already present in the body text (factor of 5-6; Metcalfe & Mischel 1999). The FAQ does not mention the Big Dig cost overrun or the hot/cool system citation at all, so no secondary fix was needed.

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