₹500 — the value of the next-best alternative, which was coaching.

It is not ₹800 — that is what he gained, not what he gave up.
It is not ₹500 + ₹300 = ₹800 — we never add alternatives together, because he could only ever have done one of them. Resting was available, but it was only his third-best option, so it never enters the calculation.

Disagree — but first separate two different things i

Scarcity is a relation between unlimited wants and limited means. A thing is scarce only when both hold. So we must ask which good the statement is about.

Why solar energy is scarce — both blades of the definition:

(i) Wants are unlimited. Society's demand for power keeps growing; no feasible output would fully satisfy it.
(ii) The means are limited. Converting sunlight needs panels, land, batteries, transmission lines and skilled labour — all limited, all with alternative uses. Every acre under a solar farm is an acre not under wheat.

Hence solar energy is scarce and its production carries an opportunity cost, even though the sunlight it uses is free.

The claim is wrong. Making something free changes its price to zero; it does not change its cost, and it certainly does not abolish its scarcity.

The opportunity cost is untouched. Every doctor trained for the public system is a doctor not doing something else; every rupee spent on hospitals is a rupee not spent on schools or roads. Zero price does not create resources — it only changes who pays and how.

What you would expect to observe. At a price of zero, quantity demanded is very large, while the quantity that can be supplied is still limited by real resources. So demand exceeds supply, and since price can no longer do the rationing, something else must:

waiting lists · long queues · appointment delays · triage by urgency

These are not signs that the policy has failed. They are scarcity reappearing in a non-price form. The good is still being rationed — just by time and administrative rule instead of by money.

Looking ahead: this is exactly the analysis of a price ceiling in Chapter 5 — a price held below equilibrium produces excess demand, and the shortage is then managed by rationing and queues. A zero price is simply the most extreme ceiling possible.

Note what is not being claimed. None of this says free healthcare is a bad policy. It may be an excellent one — that is a normative question. The positive point is only that free provision redistributes the cost; it does not eliminate it.

1. For whom — it decides who receives the education produced.
2. How — same cloth, a different (capital-intensive) technique.
3. What — the combination of goods produced is being changed.
4. For whom — distribution of output among individuals.

(a) It eliminates none of them. The discovery makes the country richer, not unconstrained. Resources are now larger, but still finite, while wants remain unlimited. Scarcity is a relation, and enlarging one side of it does not dissolve it.

All three questions still demand answers — indeed more urgently, because there is now more to allocate:

What? Refine the oil, or export it crude? Invest the revenue in schools, or defence, or consumption today?
How? Extract with imported capital-intensive rigs, or with more domestic labour?
For whom? Who receives the revenue — the state, private firms, citizens directly?

(b) It makes "for whom" hardest. The other two are largely technical and economic. Distribution is distributive, and a large windfall accruing to one point in the economy creates an intense conflict over who captures it. A discovery of this kind typically raises the political stakes far more than it raises the engineering ones.

(c) The PPF shifts outward. More resources means a greater maximum producible of both goods, so the curve moves out — probably asymmetrically, swinging further along the axis of oil-related goods than along others.

The general lesson: growth relaxes scarcity, it never abolishes it. A country ten times richer than another faces exactly the same three central problems — it simply answers them at a larger scale.

(a) P→Q: 15−14 = 1  ·  Q→R: 14−12 = 2  ·  R→S: 12−9 = 3  ·  S→T: 9−5 = 4

(b) MOC rises (1, 2, 3, 4), so the PPF is concave to the origin. Reason: resources are specialised. The units shifted from butter to guns first are those least suited to butter; as we continue, we must give up increasingly butter-productive resources, so each extra gun costs more butter.

1. No shift. The economy moves to a point inside the PPF — attainable but inefficient. i
2. Outward shift — better technology raises the maximum producible of both.
3. Inward shift — the economy's capital stock, and hence its capacity, has fallen.
4. Rotation, not a parallel shift. The corn intercept moves out; the cotton intercept stays where it is. This is a biased improvement. i

(a) Economy P. It is producing more of the goods people consume directly, so its citizens enjoy a higher standard of living right now. Both are efficient — neither is wasting anything — they have simply chosen different points on the same frontier.

(b) Ten years later, Q's PPF has shifted much further outward.

So Q's choice feeds back into the frontier itself. P's does not. After ten years, Q can produce more of both goods than P — including more consumer goods.

(c) Not necessarily — and this is the real point of the question.

Q bought its larger future frontier by sacrificing consumption for ten years. That sacrifice was real: a decade of lower food and clothing for its citizens. Whether the future gain justifies the present sacrifice is a normative question, not a positive one. It depends on how much a society values the present against the future — and economics cannot settle that from data alone.

What we can say positively: the choice between consumer goods and capital goods is genuinely a choice between consumption today and consumption tomorrow. That is the deepest opportunity cost an economy faces — and it is one of the "what to produce" trade-offs listed at the start of this chapter.

This is not a hypothetical. It describes a real and much-debated policy choice for developing economies, including India after Independence — how heavily to invest in heavy industry and infrastructure at the expense of present consumption.

1. Demand rises at the existing price → excess demand.
2. Buyers compete for limited stock → the price rises.
3. The higher price signals that society values this shoe more than before, and rewards anyone who makes it.
4. Producing sneakers becomes more profitable than the alternatives.
5. Firms shift resources — leather, labour, machine time — into sneakers and away from other goods.
6. Output rises; the extra supply moderates the price.

This solves "What to produce, and in what quantities?" — the problem of allocation. Note that no authority ordered it. The price did the whole job.

(a) The price mechanism responds to demand backed by purchasing power — not to need.

So the mechanism works exactly as designed, and still under-produces these goods, for two distinct reasons:

1. No purchasing power behind the need. The very poor may desperately need vaccination, but if they cannot pay, the market registers no demand and no firm finds it profitable. Meanwhile a small number of wealthy buyers generate strong signals for luxury goods. The market allocates to purchasing power, not to urgency.

2. The producer cannot capture the benefit. Clean air or basic research benefits everyone, including those who did not pay. A firm cannot charge for a benefit it cannot withhold, so it cannot profit from producing it — however valuable it is.

(b) Chiefly "for whom", and to some extent "what". And crucially, "badly" is a normative judgement. The market is not malfunctioning — it is doing precisely what it does, which is to allocate according to willingness and ability to pay. Calling the outcome unsatisfactory requires a value judgement that the resulting distribution is undesirable.

(c) This is the entire case for the mixed economy.

The textbook's own justification for government intervention is exactly this: if a good "very important for the prosperity and well-being of the economy as a whole, e.g. education or health service, is not produced in adequate amount by the individuals on their own", the government may induce its production or produce it itself. And where some people's share is so small that "their survival is at stake", the authority may intervene for a more equitable distribution.

So the mixed economy is not a compromise born of indecision. It is a recognition that markets are extremely good at some things and structurally incapable of others, and that the two mechanisms have complementary strengths.

Keep the two kinds of claim separate. That the market under-supplies these goods is positive — it follows from how price signals work. That it should be corrected is normative. Chapter 1 taught you to distinguish these; this question is where the distinction earns its keep.

1. Positive — a factual claim about what happened; checkable against data.
2. Normative — "should"; a value judgement about what is desirable.
3. Positive — a prediction. It may turn out wrong, but it is still positive: what makes a statement positive is that evidence could settle it, not that it is correct.
4. Normative — "unfair" is a value judgement.
5. Positive — a verifiable statement of fact.

Note statement 3 carefully — students routinely mark predictions as normative. Positive ≠ true. Positive = testable.

1. Micro — a single firm, a single product's price.
2. Macro — the general price level for the whole economy.
3. Micro — an individual decision-making unit. (This is exactly Chapter 2.)
4. Macro — an aggregate for the whole economy.
5. Micro — one particular market, even though many people are in it.

Watch item 5. "Many people involved" does not make something macro. What matters is whether we are studying one market or the whole economy.

(a)

Positive: "would raise total employment by about 2%" and "would reduce the earnings of the lowest-paid workers". Both are claims about what would happen — predictions that evidence could confirm or refute. They are positive even if they turn out to be wrong; what makes a claim positive is that it is testable, not that it is true.

Normative: "on balance the country should not remove it". The words "on balance" and "should" give it away — this weighs a gain for one group against a loss for another and delivers a verdict. No amount of data can do that weighing for you.

(b) It is genuinely both, and the honest answer says so.

This illustrates the textbook's own caution that the division is one of method and focus, not of subject matter, and that the two are interdependent: the aggregate employment figure is nothing but the sum of what happens in individual labour markets.

(c) No — neither is necessarily wrong.

They agree on every positive claim. Their disagreement is normative: how much weight to give a 2% employment gain against a fall in the earnings of the poorest. That is a disagreement about values, not about facts, and evidence cannot adjudicate it.

Why this matters for how you read economics. Many public disagreements between economists look like factual disputes but are really value disputes wearing technical clothing. Learning to separate the two is one of the most useful habits this chapter can give you — and it is why the textbook insists that a proper understanding of one is "not possible in isolation to the other".

Because resources are scarce and have alternative uses, every economy must decide:

(i) What to produce and in what quantities — which combination of goods (food vs luxuries, agriculture vs industry, consumer goods vs capital goods).
(ii) How to produce — which technique and which combination of resources (labour-intensive vs capital-intensive), choosing the least-cost method.
(iii) For whom to produce — how the output is distributed among individuals; who gets more and who gets less.

The first two together constitute the problem of allocation of resources; the third is the problem of distribution.

2. The production possibilities of an economy are the various alternative combinations of goods and services that it can produce from its given resources and given technology, when those resources are fully and efficiently employed. The collection of all such combinations is the production possibility set.

3. The production possibility frontier is the curve showing the different combinations of two goods that can be produced when the economy's resources are fully and efficiently employed. It gives the maximum quantity of one good obtainable for any given quantity of the other. It slopes downward (more of one means less of the other) and is normally concave to the origin (marginal opportunity cost rises). Points inside it are inefficient; points outside it are unattainable.

Economics studies how a society uses its scarce resources, which have alternative uses, to satisfy its unlimited wants. Since resources are scarce, every society must make choices, and every choice has an opportunity cost.

Its subject matter therefore covers the basic economic activities of production, exchange and consumption, and centres on the allocation of scarce resources among competing uses and the distribution of the resulting output among individuals.

For study it is divided into two branches: microeconomics, which examines individual consumers and firms and the determination of price and quantity in particular markets; and macroeconomics, which examines aggregates such as total output, employment and the general price level.

In practice all economies are mixed; they differ only in the extent of the government's role.

6. Positive economic analysis studies how the different economic mechanisms actually function — it describes and explains what is. Its statements are factual and can in principle be verified against evidence. e.g. "A rise in price reduces quantity demanded."

7. Normative economic analysis evaluates whether those mechanisms and their outcomes are desirable — what ought to be. Its statements involve value judgements and cannot be settled by facts alone. e.g. "The government should subsidise foodgrains."

The two are closely related: judging a policy sensibly requires first understanding how it works.

8. Microeconomics studies individual economic agents — a consumer, a firm, a single market — and how the price and quantity of a particular good are determined. Macroeconomics studies the economy as a whole through aggregates such as national output, total employment and the general price level. Micro is "price theory"; macro is "income and employment theory".