Introduction to Economics and Basic Concepts
The opening domain of ASSEB HS Economics centres on scarcity: unlimited wants against limited resources that have alternative uses. Questions check exact definitions and then test whether you can apply opportunity cost and the production possibility frontier (PPF) to a small numerical or logical situation.
Core rules
- Every economy answers three central problems: what to produce, how to produce, and for whom to produce. These arise because of scarcity, not poverty.
- Microeconomics studies individual units (one consumer, one firm, one market); macroeconomics studies aggregates (national income, general price level). Positive statements are testable; normative statements involve value judgements.
- Opportunity cost is the value of the next best alternative forgone, not the money paid.
- The PPF shows combinations of two goods producible with given resources and technology. Points on the curve are efficient, points inside show underutilisation, points outside are unattainable.
- The PPF is concave to the origin because marginal opportunity cost rises: resources are not equally suited to both goods. Resource growth or general technical progress shifts the curve outward; a technique specific to one good rotates it.
Worked example
An economy moves along its PPF from 10X and 0Y to 8X and 4Y. Gain = 4Y, sacrifice = 2X, so the marginal opportunity cost of 1Y = 2/4 = 0.5X. If the next step costs 3X for 3Y, MOC becomes 1X. This rising MOC is precisely why the curve bends outward from the origin.
Traps that cost marks
- Writing opportunity cost as the rupee price actually paid.
- Calling a point inside the PPF unattainable; it is attainable but inefficient.
- Confusing an outward shift of the whole curve with a rotation caused by one-good technical change.
- Treating the PPF as a statement about what a country should produce; it is a factual boundary, not a welfare judgement.