Introduction to Microeconomics and Basic Concepts
The Maharashtra HSC Economics paper opens with microeconomic foundations: how a scarcity-bound economy allocates limited resources among unlimited wants. Questions here are usually definition-based or reasoning-based - distinguish micro from macro, state the central problems, and read a production possibility curve correctly.
Core rules
- Scarcity and choice are the twin roots of the subject: resources are limited, wants are unlimited, so every choice carries an opportunity cost.
- Microeconomics studies individual units - a consumer, a firm, a single market. Macroeconomics studies aggregates - national income, general price level, total employment.
- Central problems of every economy: what to produce, how to produce, and for whom to produce.
- Factors of production and rewards: land–rent, labour–wages, capital–interest, entrepreneur–profit.
- Positive statements are verifiable facts; normative statements are value judgements ("ought").
- The PPC is concave to the origin because opportunity cost rises as production shifts.
Worked example
An economy moves from combination A (0 units of X, 100 units of Y) to B (20 X, 90 Y). The gain is 20 X; the sacrifice is 10 Y. Opportunity cost of one unit of X = 10/20 = 0.5 units of Y. If the next move, to C (40 X, 70 Y), costs 20 Y for 20 X, opportunity cost has risen to 1 unit of Y per unit of X - exactly why the PPC bends outward.
Traps that cost marks
- Writing that microeconomics studies small economies - it studies individual units, not small countries.
- Treating opportunity cost as the money paid; it is the next best alternative forgone.
- Assuming a PPC is a straight line; constant opportunity cost is the special case, not the rule.