Mental Accounting: Why a Dollar Is Not Always a Dollar

What is this page about?

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.

What has been corrected on this page?

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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