Economics Basics: How People, Firms and the State Choose

What is economics? Needs, goods and scarcity

Economics studies how people, firms and governments use limited resources to meet unlimited wants. The economy is one part (sphere) of life, like politics or culture: the part where we produce, share and use goods.

• Needs: things we must have (food, water, shelter, health). Wants: things we would like (a new phone).
• Goods are things you can touch (rice, bicycles). Services are actions done for you (a haircut, teaching).
• Free goods (air, sunlight) are unlimited and cost nothing. Economic goods are scarce and have a price.
• Consumer goods are used directly (bread). Capital goods help make other goods (an oven, a tractor).
• Public goods (street lights, national defence) can be used by everyone, and one person's use does not reduce another's.

Scarcity means resources (land, labour, capital, entrepreneurship) are too few for all our wants. So we choose, and the opportunity cost is the next best option we give up.

Key economic questions and limits on choice

Every society must answer:

1. What to produce, and how much? (rice or phones?)
2. How to produce? (machines or hand labour? solar or coal?)
3. For whom? (who gets the goods: by income, need or the state's choice?)

These link to the three stages of economic life: production → distribution → consumption.

When people choose, economists often assume they are rational: they compare costs and benefits and pick what gives them the most utility (satisfaction), based on their preferences. But choices are limited by constraints: income (budget), time and information. Every choice is a trade-off.

Economic agents: households, firms and the state

• Households: supply labour and other resources; earn wages, rent, interest; spend on goods and save.
• Firms: combine resources to produce goods and services, sell them and try to earn profit. They pay wages to households.
• The state (government): makes laws, protects property and contracts, collects taxes, provides public goods (roads, schools, health), helps the poor and tries to keep the economy stable.
• Also: banks (link savers and borrowers) and the rest of the world (exports, imports).

They are linked in a circular flow: money flows from households to firms for goods, and back to households as wages; the state takes taxes and gives services.

The economics of the firm

A firm is a unit that produces goods or services to sell.

• Types by ownership: sole trader (one owner), partnership, company (owned by shareholders, limited liability), cooperative (owned by members, like Amul dairy), state-owned enterprise.
• Types by size: micro, small, medium, large.
• Types by sector: primary (farming, mining), secondary (factories), tertiary (services).

Key formulas:

• Revenue = price × quantity sold
• Total cost = fixed cost (rent, does not change with output) + variable cost (materials, changes with output)
• Profit = revenue − total cost (a negative profit is a loss)

Organisation: functions like purchasing, production, marketing, finance and human resources; a structure (owners → managers → workers) and processes linking them.

Stakeholders: owners, workers, customers, suppliers, lenders, the government and the local community. Each wants something different.

Goals: economic (profit, growth, market share), social (fair wages, safe jobs) and ecological (less pollution). They can conflict: cheaper production now may pollute and hurt profits later, so firms balance short-term and long-term goals.

Economics as a science: micro, macro and methods

• Microeconomics: one household, one firm, one market (price of tomatoes, a firm's costs).
• Macroeconomics: the whole economy (GDP, unemployment, inflation, government budget, trade).
• Positive economics describes what is ("prices rose 5%"); normative economics says what should be ("prices should be controlled").

Methods: observation and data, statistics, models (simple pictures of reality, like demand and supply), "other things equal" (ceteris paribus) thinking, and experiments.

Economic laws are tendencies, not exact rules, e.g. the law of demand: when price rises, people usually buy less.

Functions of economics: explain (why prices change), predict (what a tax will do) and advise policy.

Big names: Adam Smith (1776, the "invisible hand" of markets), David Ricardo (trade), Karl Marx (critique of capitalism), John Maynard Keynes (governments can fight depressions), and Nobel laureates such as Amartya Sen (welfare, famines) and Abhijit Banerjee and Esther Duflo (field experiments against poverty).

Social goals of the economy

A country's economy aims at people's well-being. Common goals:

1. Economic growth: rising GDP (gross domestic product: the total value of final goods and services made in a country in a year).
2. Full employment: low unemployment (people who want work but cannot find it).
3. Stable prices: low, steady inflation.
4. Fair distribution of income and a safety net.
5. Sustainability: growth that does not ruin the environment.

Economies move in business cycles: expansion → peak → recession → trough → recovery. The state uses taxes, spending and interest rates to smooth them.

Goals can clash: very fast growth can raise inflation; protecting jobs can raise costs. In wartime or disasters, the state may control production and prices to meet urgent needs, which shows how goals change with circumstances.

Key formulas and definitions

• Revenue = price × quantity
• Total cost = fixed cost + variable cost
• Profit = revenue − total cost
• Opportunity cost = value of the next best option given up
• Unemployment rate = unemployed ÷ labour force × 100%

Worked examples

Common mistakes

• Mixing up revenue and profit. Revenue is all the money from sales; profit is what is left after costs.
• Thinking a lower price always means more profit. More cups sell, but each cup earns less, and you can make a loss.
• Mixing micro (one firm or market) with macro (whole economy).
• Thinking opportunity cost is the money you spend. It is the next best option you give up.