Final answer:
What you can afford is principally limited by the amount of money available at your disposal due to the fundamental economic concept of scarcity and the resulting budget constraint.
Step-by-step explanation:
What you can afford is limited by money. This concept is deeply tied to the idea of scarcity in economics, where the budget constraint represents the limit of what individuals can consume based on their available resources. Every decision on consumption faces this constraint where one has to choose between varying quantities of goods and services to satisfy unlimited wants with limited resources. Preferences, externalities, substitutes, and demand may influence what you choose to spend your money on, but ultimately, it is the amount of money you have that determines what you can and cannot afford.