Why it matters
Categories can make budgeting manageable, but money retains the same purchasing power across labels. Consider the whole financial position as well as individual pots.
A worked example
Someone spends a £100 bonus freely but protects £100 of wages, despite the amounts having the same purchasing power. Labels change the choice.
Illustrative example · simplified assumptionsA common mistake
Ignoring the overall budget because a purchase comes from “bonus money”.
Where the idea needs care
Separate budgets can be useful commitment tools; the concept does not mean every category is harmful.
Apply the idea
Explain this concept using a different example from your spending, work, business or a policy debate. State what stays fixed and what could change the result.
See the supporting infographic
The written explanation above is the main lesson. This image offers another way to remember it.
Sources and further study
Examples and explanations by Alibomics. Numeric illustrations are not current market quotations.