Oddly Wired
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money

You treat the same amount of money differently.

Mental accounting causes people to categorize money into different 'accounts' based on the source, leading to irrational spending.

People are far more likely to spend a windfall gain—like a small lottery win—on non-essentials than they are to spend the exact same amount if it was earned through labor.

You budget by origin rather than by value.

Where this comes from

Study
Richard Thaler, 1985
What the check found
The attribution to Richard Thaler's 1985 work is correct, and the description of mental accounting as a source of non-fungible categorization is the consensus view of the theory.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.