Introduction to Economics and Basic Concepts
Introduction to Economics and Basic Concepts is the foundation domain: BIEAP tests scarcity, opportunity cost, the production possibility frontier, positive versus normative analysis, and the three central problems. Expect definitional precision and diagram-based reasoning even when no diagram is printed.
Core rules
- Scarcity means unlimited wants exceed limited resources; it forces choice, and every choice has an opportunity cost - the value of the next best alternative forgone.
- A PPF shows maximum combinations of two goods with given resources and technology. Points on the curve are efficient, inside are unemployment or inefficiency, outside are unattainable.
- Movement along a PPF reflects reallocating resources; a shift outward requires growth in resources or better technology.
- Microeconomics studies individual units; macroeconomics studies aggregates. Positive statements are testable; normative statements contain value judgments.
- Market, centrally planned and mixed economies answer what, how and for whom to produce differently.
Worked example
A farmer can grow either 100 tonnes of rice or 50 tonnes of wheat on fixed land. The opportunity cost of 1 tonne of wheat is 100/50 = 2 tonnes of rice. If technology raises both maximum outputs, the PPF shifts outward rather than the farmer moving along it.
Traps
Do not call money paid for a good its opportunity cost; the cost is the forgone alternative. Do not confuse a shift of the PPF with a movement along it. Do not label “the government should subsidise farmers” positive - it is normative.