Mental Accounting

The tendency to categorize money into distinct psychological “accounts” and treat funds differently based on their mental category. Proposed by Richard Thaler in the 1980s, mental accounting explains why a windfall feels more freely spendable than equivalent hard-earned income, and why people resist moving money between mental categories even when the outcome is identical.

In pricing, monthly subscription framing (¥1,000/month) routes the expense to a “small recurring” mental account, reducing payment pain compared to an equivalent annual charge (¥12,000/year). Bundling exploits the same mechanism: a joint bundle price is evaluated against a single mental account rather than triggering separate assessments of each component’s value.