Think back over the day. A treasurer who will not spend five cents marches his sister forty blocks; she grumbles but walks. At closing time the two stand on toilets, silent, while keys jingle past the stall doors. By midnight they are whispering under a carved canopy in a museum that believes itself empty. Every problem met a plan — his plans saved money, hers saved style — and the partnership held.

Every group that handles shared money needs a treasurer: someone responsible for recording the funds and protecting the group’s plan. A treasurer tracks what comes in and what goes out rather than simply guarding a box of cash. The central tool is a budget, a written plan that assigns limited money to purposes before it is spent. Income adds to the available amount, while expenses reduce it; the difference shows whether the plan is sustainable. Recording each purchase against the budget lets members see whether enough remains for later needs.

A workable budget ranks needs instead of treating every request equally. A necessity, such as food, shelter, or an unavoidable fare, directly supports safety or the group’s goal; a luxury adds comfort or pleasure but is not essential. Choosing one luxury also creates an opportunity cost because the same money cannot fund something else. Treasurers may seem unpopular when protecting the shared goal requires declining an attractive request. In Chapter 3, Jamie’s refusals about fares and conveniences preserve the runaways’ limited cash as they walk to the museum and move in; the larger lesson is not that spending is wrong, but that each expense must serve the plan.

No right or wrong — close the screen and tell someone nearby what happened in this part. Can’t find anyone? Tell yourself out loud. The moment you teach it, you truly understand it.