Business economics: basic concepts, micro and macro
Economics studies how people make choices under scarcity. Every choice has an opportunity cost: the next best alternative given up.
What business economics is
Economics is the study of how people, firms and governments use scarce resources to satisfy wants that have no limit. Business economics applies the same tools to business decisions: what to produce, what price to charge, how many workers to hire and how to respond to inflation or interest rate changes. The resources, called factors of production, are land (earns rent), labour (earns wages), capital (earns interest) and entrepreneurship (earns profit). Because they are scarce, every society must answer three basic questions: what to produce, how to produce it, and for whom.
The basic economic problem
This chain applies to a household budget, a firm's factory floor and a government's annual budget alike.
Worked example: opportunity cost on a production possibility curve
A garment factory can use its machines and workers to make shirts or trousers. Its production possibilities per day are: A (0 trousers, 1,000 shirts), B (100, 900), C (200, 750), D (300, 550), E (400, 300), F (500, 0). Find the opportunity cost of each extra 100 trousers, and of one trouser.
- A to B: shirts fall 1,000 − 900 = 100, so 100 trousers cost 100 shirts. One trouser costs 100 ÷ 100 = 1 shirt.
- B to C: shirts fall 900 − 750 = 150. One trouser costs 150 ÷ 100 = 1.5 shirts.
- C to D: shirts fall 750 − 550 = 200. One trouser costs 200 ÷ 100 = 2 shirts.
- D to E: shirts fall 550 − 300 = 250. One trouser costs 250 ÷ 100 = 2.5 shirts.
- E to F: shirts fall 300 − 0 = 300. One trouser costs 300 ÷ 100 = 3 shirts.
- The cost rises at each step (1 → 1.5 → 2 → 2.5 → 3) because workers and machines best suited to shirts are moved to trousers last.
Opportunity cost per trouser rises from 1 to 3 shirts: the law of increasing opportunity cost, which makes the PPC bow outwards.
Microeconomics and macroeconomics compared
| Point | Microeconomics | Macroeconomics |
|---|---|---|
| Studies | Individual units: a consumer, a firm, one market | The economy as a whole: total output, total spending |
| Main price | The price of one good (e.g. tea, cement) | The general price level (inflation) |
| Key questions | How is the price of rice set? How much should a firm produce? | Why does unemployment rise? What causes inflation and growth? |
| Main tools | Demand and supply, elasticity, cost curves | National income, AD-AS, IS-LM, fiscal and monetary policy |
| Example | A bakery deciding its bread price | The CBSL changing its policy interest rate |
Other fundamental concepts
- Ceteris paribus: 'other things being equal'. Economists change one factor at a time to see its effect.
- Marginal thinking: decisions are made at the margin, by comparing the extra benefit with the extra cost of one more unit.
- Rational behaviour: consumers try to maximise satisfaction (utility); firms try to maximise profit.
- Positive economics describes what is (testable facts); normative economics says what ought to be (value judgements).
- Free goods (air) have no opportunity cost; economic goods (rice, electricity) are scarce and have a price.
- Production possibility curve (PPC): shows the maximum output combinations with given resources. Points inside it show unemployed resources; points outside are unattainable today.
An apparel exporter such as MAS faces scarcity every day: factory floor space, skilled machine operators and shipping deadlines are limited. Accepting one large order has an opportunity cost, the next best order it must turn down. Good managers compare the two before saying yes.
Short answer: “Define opportunity cost.” Opportunity cost is the value of the next best alternative given up when a choice is made, e.g. the wages a student gives up to study full time.
Structured question: “Distinguish between microeconomics and macroeconomics with examples.” Define each, then compare scope, price studied, key questions and tools. Give one business example for each, e.g. a firm's pricing versus CBSL policy.
Essay: “Explain the basic economic problem and show how a production possibility curve illustrates scarcity, choice and opportunity cost.” Define scarcity and the three basic questions, draw a bowed-out PPC, show inside, on and outside points, compute increasing opportunity cost and explain shifts of the PPC.
S-C-O: Scarcity forces Choice, and every choice has an Opportunity cost. Micro = My firm, my market; Macro = the Massive whole economy.