Variable Expenses
Necessary costs whose size moves around — groceries, petrol, power — the part of the budget that needs a buffer, not a guess.
Variable expenses are needs without fixed price tags. You will definitely buy groceries; the total depends on the week. Power bills swing with the seasons — NZ winter bills routinely run well above summer ones.
The workable approach is budgeting to a realistic average with headroom, then watching the trend rather than the single week. Precision here is false comfort; direction is what matters.
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