In economic analysis, a resource must be scarce if:
consuming it involves an opportunity cost.
its supply is completely fixed in the long run.
it can only be purchased using money.
the government chooses to ration its distribution.
123 exam-style questions on AQA A Level Economics 1.1 Economic methodology and the economic problem, covering 1.1.1 Economic methodology, 1.1.2 The nature and purpose of economic activity, 1.1.3 Economic resources, 1.1.4 Scarcity, choice and the allocation of resources, and 1.1.5 Production possibility diagrams. Each one has a worked solution and a mark scheme showing where the marks go.