Q.State whether the following statement is True or False : Per capita income is the average income earned by the people of the country.

Economic Terminology: The Language of Scarcity and Choice

Every field has its own vocabulary. In cricket, you need to know "googly," "silly point," and "LBW" to follow the game. Economics is no different — it has a precise set of terms that let us talk clearly about how people, firms, and governments make decisions when resources are limited.

Let's start with the most fundamental term of all.

Scarcity — The Mother of All Economic Problems

Imagine you have ₹500 pocket money for the month. You want a new video game (₹400), a movie ticket (₹200), and a nice dinner with friends (₹300). You cannot have all three. That gap between what you want and what you can afford is scarcity.

Because of scarcity, every choice involves a trade-off. Economics is the study of how we manage these trade-offs.

Opportunity Cost — The Real Price of Anything

When you chose the video game over the movie and dinner, what did you really pay? ₹400, yes. But you also gave up the enjoyment of the movie and the dinner. That forgone next-best alternative is your opportunity cost.

There is no formula with numbers here — it's a concept. But it is the single most powerful idea in economics. Every decision, from what to study to which job to take, has an opportunity cost. Good decision-making means comparing not just the obvious cost (the price tag) but the hidden cost (what you give up).

Utility — The Satisfaction You Get

Why do you buy anything? Because it gives you satisfaction. Economists call this utility. It's not measurable in absolute units (you can't say "this pizza gives me 17 utils"), but it helps explain behaviour.

The key insight is diminishing marginal utility: the first slice of pizza is heavenly, the fifth is just okay, and the tenth makes you sick. Each additional unit gives less extra satisfaction than the one before.

Demand and Supply — The Two Forces

Demand is not just "wanting" something. It is wanting something and being able to pay for it. My desire for a Ferrari is not demand — I can't afford one.

Supply is the quantity of a good that producers are willing to sell at a given price.

The interaction of these two forces determines market price. When demand exceeds supply, price rises. When supply exceeds demand, price falls. At the equilibrium price, the quantity consumers want to buy exactly equals the quantity producers want to sell.

Production Possibility Frontier (PPF) — Seeing Scarcity on a Graph

Imagine an economy that produces only two things: wheat and cloth. If all resources go to wheat, you get 100 tonnes of wheat and zero cloth. If all go to cloth, you get 50 metres and zero wheat. The PPF is the curve connecting all combinations you can produce with full efficiency.

Any point on the curve is efficient — you cannot produce more of one good without producing less of the other. Any point inside the curve means resources are wasted. Any point outside is impossible with current resources.

Gross Domestic Product (GDP) — Measuring the Economy's Size

GDP is the total market value of all final goods and services produced within a country's borders in a given year. It is the most watched number in macroeconomics.

This is the expenditure method of calculating GDP. There are two other methods (income method and value-added method), and all three must give the same answer — that's the circular flow of income in action.

Inflation — When Prices Rise …