If you want to buy you must what?
Options:
- spend money
- go shopping
- paying
- have in mind
- a shop
Please answer and provide answer explanation.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Buying involves expenditure. Expenditure is met by spending money. The final answer: spend money.