Introduction

This is Chapter 1 of Introductory Microeconomics (Class 12). It is short — seven pages (1–7) with five sections (1.1 a simple economy; 1.2 central problems, including the production possibility frontier; 1.3 organisation of economic activities; 1.4 positive and normative economics; 1.5 micro and macro; 1.6 plan of the book), one worked example with a table and a figure, and eight exercise questions. It has no activities and no numericals to solve. We have not padded it: the sections below follow NCERT's order, with the production possibility frontier — the one technical tool — worked through in full from the book's own numbers, plus clearly marked Beyond-NCERT material that later chapters and UPSC assume.

• Leads into this book: consumer choice under a budget (Chapter 2 — the consumer's own ‘frontier’ is the budget line), production and costs (Chapter 3), the competitive firm (Chapter 4) and market equilibrium, including price ceilings and floors (Chapter 5).
• Pairs with the macro book (live): Introductory Macroeconomics Chapter 1 (leec101 — micro vs macro, Adam Smith, Keynes, the capitalist economy) and Chapters 2–6 (leec102–106 — national income, money, income determination, the budget, the open economy).
• Pairs with Indian Economic Development (live): keec101 (the economy at Independence), keec102 (1950–1990: planning and the mixed economy, the Mahalanobis model) and keec103 (1991 reforms: a larger role for markets) — India's real-world answers to the ‘who decides?’ question in section 4.
• UPSC, honestly: microeconomics is a lighter area than macroeconomics in UPSC. Prelims tests its concepts occasionally — opportunity cost (2018), mixed economy (1980–82); most micro questions (elasticity, market forms, price controls, MSP) belong to later chapters of this book. GS3 uses the ideas in answers on resource allocation, subsidies, planning and markets, rather than asking about them directly.

• Scarcity: resources are limited relative to wants, at every level — so choice is unavoidable; more of one thing means less of another.
• Central problems: what (and how much) to produce, how to produce, for whom — i.e. allocation of resources and distribution of output.
• Production possibility set = all combinations producible with given resources and technology; the PPF is its outer edge (resources fully used).
• Table 1.1: A (0 corn, 10 cotton) · B (1, 9) · C (2, 7) · D (3, 4) · E (4, 0) → extra corn costs 1, 2, 3, 4 cotton: rising opportunity cost, bowed-out frontier.
• Inside the PPF = idle or wasted resources; outside = unattainable. Opportunity cost is also called economic cost (NCERT).
• Organisation: centrally planned vs market (coordinated by price signals); all real economies are mixed. Positive (how it works) vs normative (is it desirable). Micro vs macro.

People need many goods and services — food, clothing, shelter, roads and railways, postal services, teachers and doctors — but each individual (a person, household, firm or organisation) has only a little of a few. A family farm may have a plot of land, grain, tools, a pair of bullocks and the family's labour; a weaver has yarn, cotton and instruments; a teacher has skills; some people have nothing but their own labour. Each produces something with its resources and exchanges part of the output — directly or for money — for the many other things it needs.

No one has unlimited resources compared with her needs, so each must choose: more of one good or service only by giving up some of another — a bigger house may mean fewer acres of farmland; more and better schooling for the children may mean fewer luxuries. Everyone faces scarcity and must use limited resources in the best possible way. Society faces it too. What people collectively want must be compatible with what is produced: if people want less corn than farms can grow, some resources could be moved to goods in higher demand; if they want more, resources should move into corn. Society's scarce resources must be allocated among goods in keeping with people's likes and dislikes, and the resulting output distributed among individuals — the two basic economic problems.

Production, exchange and consumption are basic economic activities, and in all of them scarcity creates the problem of choice: scarce resources have competing uses. The problems are usually summarised as three questions.

Given its total resources, an economy can allocate them in many ways and get different mixes of goods. The collection of all combinations that can be produced from a given amount of resources and a given stock of technological knowledge is the production possibility set. NCERT's Example 1: an economy that can produce corn or cotton, with some of its combinations at full use of resources given in Table 1.1.

The first three columns are NCERT's; the last three are our arithmetic from them. With all resources in corn, the most is 4 units; all in cotton, at most 10. The curve through these points gives the maximum amount of corn for any amount of cotton and vice versa: the production possibility frontier. Any point on or below it is producible; a point strictly below it means some resources are underemployed or used wastefully. Because more resources in corn leave fewer for cotton, more of one good costs some of the other — the opportunity cost of an additional unit. NCERT adds that the idea applies to individuals as well as society, and that opportunity cost is sometimes called the economic cost. Every economy must choose one of its many possibilities.

The central problems can be solved through the free interaction of individuals pursuing their own objectives, as in a market, or in a planned way by a central authority such as the government. In a centrally planned economy the government plans all important activities and decides production, exchange and consumption, aiming at an allocation and distribution it considers desirable for society. If something vital — education or health — is under-produced, it may induce people to produce more or produce it itself; if some people get so little that their survival is at stake, it may intervene for an equitable distribution.

In a market economy all activities are organised through the market — an institution (an organisation with a purpose) that organises the free interaction of individuals; a set of arrangements where agents freely exchange endowments or products. It need not be a physical place: a village chowk, a city super bazaar, the telephone or the internet will do. What coordinates millions of isolated decisions? Prices, mutually agreed by buyers and sellers, which on average reflect society's valuation of a good. If buyers want more of a good its price rises, signalling producers to produce more; so price signals solve ‘what and how much’ in a market system. In reality all economies are mixed: some important decisions are taken by government while activity is largely conducted through markets; they differ only in the extent of the government's role. NCERT's examples: the role of government is minimal in the USA; the closest example of central planning is China for much of the 20th century; in India the government has played a major planning role since Independence, reduced considerably in recent decades.

Different mechanisms (planning, markets, mixes) will usually give different solutions to the central problems — different allocations and different distributions — so we need to know which is more desirable. Economics therefore does two things: in positive analysis it studies how the mechanisms function and what outcomes they produce; in normative analysis it asks whether those outcomes are desirable. NCERT stresses that the distinction is not very sharp: positive and normative issues are closely related, and neither can be understood properly in isolation.

Economics has traditionally been studied in two branches. Microeconomics studies the behaviour of individual economic agents in markets for different goods and services and how their interaction determines prices and quantities. Macroeconomics studies the economy as a whole through aggregate measures — total output, employment and the aggregate price level — asking how they are determined and how they change over time: what is total output and how is it determined, how does it grow, are resources such as labour fully employed and why not, and why do prices rise? This book introduces microeconomics, focusing on individual consumers and producers of a single commodity and how its price and quantity are determined: consumer behaviour (Chapter 2), production and cost (Chapter 3), the producer's behaviour (Chapter 4), and price and quantity in a perfectly competitive market (Chapter 5).

The chapter has no activities or in-text questions. Try each exercise question yourself first, then open the outline. A second set of short numerical drills on Table 1.1, written for this page, follows.

Numbers

One-liners

• Scarcity forces choice — for individuals and for society.
• Central problems: what, how, for whom = allocation + distribution.
• The PPF is the edge of the possible with given resources and technology.
• Inside the PPF: waste. Outside: impossible (for now).
• Opportunity cost is the other good given up — also called economic cost.
• Rising opportunity cost makes the PPF bow outward.
• In a market, prices are signals that coordinate.
• All real economies are mixed; only the State's share differs.
• Positive: how it works. Normative: is it desirable. The line is not sharp.
• Micro: one market. Macro: the whole economy.

Traps to avoid

• The production possibility set includes points below the frontier; the frontier is only the outer edge.
• Inside the PPF = unemployment or waste, not an impossible point.
• Opportunity cost is in units of the forgone good, not money.
• Table 1.1's sacrifices (1+2+3+4) add to 10 — check, don't assume.
• A market is a set of arrangements, not a physical place.
• ‘Economic cost’ for FCI (UPSC 2019) is an accounting cost; NCERT's ‘economic cost’ means opportunity cost.
• NCERT's ‘Chapter 6’ on other market forms is not in the current book.
• ‘USA: government role minimal’ is comparative shorthand, not literal.
• China was centrally planned from 1949 and reformed from 1978 — ‘the major part of the 20th century’ is loose.

Prelims — what UPSC asks

• Opportunity cost: a commodity provided free by the government still has an opportunity cost — it is borne by taxpayers (2018). Practise reading costs off a PPF table such as Table 1.1.
• Mixed economy = coexistence of public and private sectors (1980, 1981, 1982; also on keec102). Related: market-economy thinkers Smith, Hayek, Friedman (1993, on leec101).
• Expect statement traps on the PPF: inside vs outside points, what shifts the frontier, constant vs rising opportunity cost. Watch the FCI ‘economic cost’ usage (2019).

Mains — where it appears and how to answer

• This chapter is rarely asked directly in Mains. Use its tools in GS3 answers on resource allocation and subsidies (opportunity cost of free provision), planning versus markets (India's mixed economy, 1950–1991–2015) and growth (investment goods shift the frontier out).
• When markets and the State come up, set attributed views side by side — Hayek's prices-as-information, Pigou and Samuelson on market failure, Buchanan on government failure, Drèze and Sen on public action — and avoid present-day political commentary.

Tap an option. NCERT's own exercise questions come first; the rest test the figures and common confusions.

Open any question to attempt it in the Question bank — your attempt is saved to your progress.