Class 11 Economics Chapter 10 — Introduction to Microeconomics (ASSEB, English Medium)
Welcome to HSLC Guru! This chapter opens the door to Microeconomics, the branch of economics that studies the choices made by individual decision-making units — consumers, producers, and resource owners — and the way these choices interact in markets to determine prices, quantities, and the allocation of scarce resources. In this English-medium ASSEB Class 11 study guide, you will find a clear summary, a complete set of textbook-style questions and answers (1-mark, 2–3 mark, and 5–6 mark), additional MCQs, fill-in-the-blanks, true/false items, and a glossary so that you can prepare confidently for examinations.
Summary
Definition of economics. The word economics is derived from the Greek words oikos (household) and nemein (management), meaning the management of a household. Over the years, economists have given different definitions. Adam Smith, in his 1776 book An Inquiry into the Nature and Causes of the Wealth of Nations, defined economics as the science of wealth. Alfred Marshall, in his Principles of Economics (1890), defined it as a study of mankind in the ordinary business of life, focusing on the material requisites of well-being. Lionel Robbins, in 1932, gave the most widely accepted scarcity-based definition: “Economics is the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.” Modern textbooks therefore describe economics as the study of how individuals and societies choose to use scarce productive resources to satisfy unlimited wants.
Microeconomics vs Macroeconomics. The Norwegian economist Ragnar Frisch coined the terms microeconomics and macroeconomics in 1933. Microeconomics studies the behaviour of small individual units of the economy — a single consumer, a single firm, the price of a single commodity, the demand for a particular good, or the wage in a particular labour market. Macroeconomics, in contrast, studies the economy as a whole — national income, general price level, total employment, aggregate consumption, savings, investment, and overall economic growth. Microeconomics is sometimes called price theory because the determination of relative prices is its central concern, while macroeconomics is called income and employment theory.
Scarcity and the central problems of an economy. Human wants are unlimited, but the resources (land, labour, capital, enterprise) used to satisfy them are scarce and have alternative uses. This basic fact of scarcity forces every economy to make choices, which give rise to the central problems: (i) What to produce and in what quantities — a society must decide whether to produce more food or more clothing, more guns or more butter; (ii) How to produce — whether to use labour-intensive or capital-intensive techniques; (iii) For whom to produce — how the national output is distributed among different sections of the population; (iv) the fuller utilisation of resources so that no productive resource is left idle; and (v) the problem of growth of resources over time, so that the economy can produce more goods and services in the future.
Production Possibility Frontier (PPF) and opportunity cost. The Production Possibility Frontier (also called Production Possibility Curve, PPC) is a graph showing all the maximum combinations of two goods that an economy can produce when its resources and technology are given and are fully and efficiently used. The PPF normally slopes downward from left to right because to produce more of one good the economy must give up some quantity of the other. The amount of the second good sacrificed to obtain one extra unit of the first good is called the opportunity cost or marginal rate of transformation. The PPF is concave to the origin because opportunity cost generally rises as more of a good is produced (resources are not equally suited to producing both goods). Points on the PPF show full and efficient utilisation; points inside show unemployment or inefficiency; points outside are unattainable with current resources but may become attainable through economic growth, which shifts the PPF outward.
Positive and Normative economics. Positive economics deals with statements of fact and “what is” — relationships that can be tested with data (e.g., “When the price of petrol rises, the demand for petrol falls”). Normative economics deals with value judgments, “what ought to be” (e.g., “The government ought to provide free healthcare”). Both are useful: positive analysis explains how the economy actually works, while normative analysis guides policy choices.
Types of economy. On the basis of how the central problems are solved, economies are classified into three types. (i) Centrally-planned (socialist) economy: a central planning authority owns the means of production and decides what, how and for whom to produce — examples include the former Soviet Union, North Korea and Cuba. (ii) Market (capitalist) economy: private individuals own the resources, and the central problems are solved through the price mechanism (forces of demand and supply) — examples include the USA, the UK and Japan. (iii) Mixed economy: both the public sector and the private sector operate side by side, and the central problems are solved partly by the market and partly by government planning — India is the classic example of a mixed economy.
Textbook Questions and Answers
1-Mark Questions
Q1. Who is regarded as the Father of Economics?
Answer: Adam Smith is regarded as the Father of Economics.
Q2. Who gave the scarcity definition of economics?
Answer: Lionel Robbins gave the scarcity definition of economics in 1932.
Q3. Who coined the terms microeconomics and macroeconomics?
Answer: The Norwegian economist Ragnar Frisch coined these terms in 1933.
Q4. What is meant by scarcity?
Answer: Scarcity refers to the limited availability of resources in relation to unlimited human wants.
Q5. What is the full form of PPF?
Answer: PPF stands for Production Possibility Frontier (also called Production Possibility Curve, PPC).
Q6. Define opportunity cost.
Answer: Opportunity cost is the value of the next-best alternative that has to be foregone in order to obtain something.
Q7. Give one example of a centrally-planned economy.
Answer: The former Soviet Union (USSR) is a classic example of a centrally-planned economy. Cuba and North Korea are present-day examples.
Q8. Give one example of a mixed economy.
Answer: India is a classic example of a mixed economy.
Q9. Why does the PPF slope downward?
Answer: Because to produce more of one good, the economy must give up some quantity of the other good, since resources are scarce.
Q10. Microeconomics is also known by which other name?
Answer: Microeconomics is also known as price theory.
Q11A. Who wrote the book An Inquiry into the Nature and Causes of the Wealth of Nations?
Answer: Adam Smith wrote it in 1776.
Q11B. Name two examples of a market economy.
Answer: The USA and the United Kingdom are examples of market economies.
2–3 Mark Questions
Q11. State Robbins’ definition of economics and mention its essential features.
Answer: Lionel Robbins defined economics as “the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.” Its essential features are: (i) human wants are unlimited; (ii) means (resources) are limited or scarce; (iii) scarce means have alternative uses; and (iv) wants differ in importance, so individuals must choose. Hence, economics is essentially a science of choice under scarcity.
Q12. Distinguish between microeconomics and macroeconomics with examples.
Answer: Microeconomics studies the behaviour of individual economic units such as a single consumer, a single firm, the demand for a particular good (e.g., rice in Guwahati market) and the price of a single commodity. Macroeconomics studies aggregate variables that describe the economy as a whole, such as national income, general price level, total employment, and aggregate demand and supply (e.g., India’s GDP, India’s rate of inflation). The two branches are complementary: microeconomics provides the foundations for understanding aggregate behaviour, while macroeconomics gives the broader environment within which individual units operate.
Q13. Distinguish between positive economics and normative economics.
Answer: Positive economics is concerned with “what is” — it analyses facts and cause-and-effect relationships that can be verified by data; for example, “An increase in the price of sugar reduces its demand.” Normative economics is concerned with “what ought to be” — it involves value judgments about whether something is desirable; for example, “The government ought to subsidise food for the poor.” Positive statements are objective and testable, while normative statements are subjective and depend on the ethical or political values of the analyst.
Q14. What are the central problems of an economy?
Answer: Because resources are scarce and wants are unlimited, every economy faces five central problems: (i) What to produce and in what quantities; (ii) How to produce — choosing between labour-intensive and capital-intensive techniques; (iii) For whom to produce — the distribution of national product; (iv) the problem of fuller utilisation of resources, so that no resource lies idle; and (v) the problem of growth of resources over time, ensuring the economy expands its productive capacity.
Q15. Briefly explain the three main types of economy.
Answer: (i) Centrally-planned economy: the means of production are owned by the State, and a central planning authority decides what, how and for whom to produce (e.g., former USSR, Cuba). (ii) Market economy: private individuals own the means of production, and the central problems are solved through the price mechanism (e.g., USA). (iii) Mixed economy: features of both planning and market exist; the public and private sectors coexist (e.g., India).
Q16. Explain the meaning of opportunity cost with an example.
Answer: Opportunity cost is the cost of the next-best alternative that has to be sacrificed when a choice is made. For example, if a farmer uses one hectare of land to grow rice and as a result gives up 4 quintals of wheat that the same hectare could have produced, the opportunity cost of growing rice on that land is 4 quintals of wheat. Opportunity cost is central to economics because every choice in a world of scarcity involves sacrificing some alternative use of the resource.
5–6 Mark Questions
Q17. Explain the Production Possibility Frontier (PPF) with the help of a schedule and discuss its main properties.
Answer: The Production Possibility Frontier (PPF), also called the Production Possibility Curve (PPC), shows the various combinations of two goods that an economy can produce with its given resources and technology, when those resources are fully and efficiently used. Suppose an economy produces only two goods — guns (G) and butter (B). The schedule below shows the possible combinations:
| Combination | Guns | Butter | Opportunity Cost (butter foregone) |
|---|---|---|---|
| A | 0 | 15 | — |
| B | 1 | 14 | 1 |
| C | 2 | 12 | 2 |
| D | 3 | 9 | 3 |
| E | 4 | 5 | 4 |
| F | 5 | 0 | 5 |
When the schedule is plotted (guns on the X-axis and butter on the Y-axis), we obtain a curve concave to the origin. Properties of the PPF: (i) it slopes downward from left to right because of scarcity — to produce more guns, butter must be sacrificed; (ii) it is concave to the origin because of increasing marginal opportunity cost — as more guns are produced, increasingly more butter is given up; (iii) points on the curve indicate full and efficient utilisation of resources; (iv) points inside show inefficiency or unemployment; (v) points outside are unattainable with current resources but may become attainable through economic growth, which shifts the PPF outward.
Q18. Define opportunity cost and show how it is measured along a PPF. Why does opportunity cost generally increase along a PPF?
Answer: Opportunity cost is the value of the next-best alternative foregone when a choice is made. Along a PPF that shows two goods X and Y, the opportunity cost of producing one extra unit of X is the amount of Y that must be given up. This is also called the marginal rate of transformation (MRT) and equals the absolute value of the slope of the PPF. Using the previous schedule, when the economy moves from combination B to C it gains 1 gun but gives up 2 units of butter, so the opportunity cost of the second gun is 2 butter; from C to D the opportunity cost is 3 butter, and so on. Opportunity cost increases as we move down the PPF because resources are not equally efficient in producing both goods. As more guns are produced, the economy must withdraw resources that were better suited to making butter, so progressively larger amounts of butter must be sacrificed for each additional gun. This is why the PPF is concave to the origin.
Q19. Explain the central problems of an economy and how they are solved differently in centrally-planned, market, and mixed economies.
Answer: Every economy faces three basic central problems on account of scarcity: (i) What to produce, (ii) How to produce, and (iii) For whom to produce; together with the problems of fuller utilisation and growth of resources. In a centrally-planned economy a central planning authority decides what shall be produced (often giving priority to defence, heavy industry, public goods), the technique of production (often capital-intensive), and the distribution of output (typically aimed at equality). In a market economy these decisions are taken automatically by the price mechanism — what to produce depends on consumer demand and willingness to pay; how to produce depends on the firm’s quest for least-cost techniques; and for whom to produce depends on the distribution of factor incomes. In a mixed economy, like India, both the State and the market play a role: the State produces public goods and infrastructure, regulates strategic sectors and pursues social objectives, while the price mechanism guides production in the private sector.
Q20. Show, with the help of a PPF, situations of (a) full and efficient utilisation, (b) unemployment / inefficiency, and (c) economic growth.
Answer: Consider a PPF for two goods, say food and clothing. (a) Full and efficient utilisation is shown by any point lying on the PPF; here all resources are employed and used efficiently. (b) Unemployment or inefficiency is shown by any point lying inside the PPF, indicating that some resources are idle or are not used in their most productive way; the economy can produce more food without sacrificing clothing, or vice versa, simply by employing those idle resources. (c) Economic growth occurs when productive resources increase (population growth, capital accumulation) or technology improves; the entire PPF shifts outward, so that combinations that were previously unattainable become attainable. A leftward (inward) shift would represent a decline in productive capacity, perhaps due to a natural calamity or war.
Q21. Discuss the importance of microeconomics in the modern world.
Answer: Microeconomics is important for several reasons:
- It provides the theoretical foundations for understanding price determination of individual goods and factor services.
- It helps explain how scarce resources are allocated efficiently among competing uses.
- It is useful for business decision-making — firms use microeconomic tools to decide output, pricing and input choices.
- It is the basis of welfare economics, which evaluates the desirability of different economic outcomes.
- It helps the government formulate policies on taxation, subsidies, regulation and consumer protection.
- It provides the micro-foundations of macroeconomic theory, since aggregate demand and supply ultimately rest on the choices of households and firms.
Q22. What is meant by the marginal rate of transformation (MRT)? Show, with the help of the schedule used in Q17, how MRT changes along the PPF.
Answer: The marginal rate of transformation is the number of units of one good that must be sacrificed in order to produce one extra unit of another good. Algebraically, MRT = ΔY / ΔX, where Y is the good being given up and X is the good being gained. It is also the absolute value of the slope of the PPF.
| Movement | Change in Guns (ΔX) | Change in Butter (ΔY) | MRT = |ΔY/ΔX| |
|---|---|---|---|
| A → B | +1 | −1 | 1 |
| B → C | +1 | −2 | 2 |
| C → D | +1 | −3 | 3 |
| D → E | +1 | −4 | 4 |
| E → F | +1 | −5 | 5 |
The MRT rises from 1 to 5 as the economy moves from combination A to F. This rising MRT confirms the law of increasing opportunity cost and is the reason the PPF is concave to the origin.
Q23. Differentiate between a centrally-planned economy and a market economy on at least four points.
Answer: The two systems differ on the following grounds:
| Basis | Centrally-planned Economy | Market Economy |
|---|---|---|
| Ownership of resources | State / public | Private individuals |
| Decision making | Central planning authority | Price mechanism (demand & supply) |
| Motive of production | Social welfare | Private profit |
| Role of consumer | Limited; planner-driven | Sovereign — guides what is produced |
| Examples | Former USSR, Cuba, North Korea | USA, UK, Japan |
Q24. What is meant by economic growth? How is it shown on the PPF diagram?
Answer: Economic growth refers to a sustained increase in the productive capacity of an economy over time, made possible by an increase in the supply of resources (labour, capital) or an improvement in technology. On the PPF diagram, economic growth is shown by an outward (rightward) shift of the entire frontier. After such a shift, combinations of the two goods that were earlier unattainable become attainable, and the economy can enjoy more of both goods simultaneously.
Additional MCQs
Q1. Economics is derived from the Greek words meaning —
(a) Wealth and money (b) Household management (c) State and people (d) Science of value
Answer: (b) Household management.
Q2. The book Wealth of Nations (1776) was written by —
(a) Alfred Marshall (b) Lionel Robbins (c) Adam Smith (d) J. M. Keynes
Answer: (c) Adam Smith.
Q3. The welfare definition of economics was given by —
(a) Adam Smith (b) Alfred Marshall (c) Robbins (d) Samuelson
Answer: (b) Alfred Marshall.
Q4. Microeconomics is also called —
(a) Income theory (b) Employment theory (c) Price theory (d) Welfare theory
Answer: (c) Price theory.
Q5. The PPF is concave to the origin because of —
(a) Constant opportunity cost (b) Decreasing opportunity cost (c) Increasing opportunity cost (d) Zero opportunity cost
Answer: (c) Increasing opportunity cost.
Q6. A point inside the PPF represents —
(a) Full employment (b) Unemployment / inefficiency (c) Economic growth (d) Unattainable combination
Answer: (b) Unemployment / inefficiency.
Q7. Which of the following is an example of a market economy?
(a) USA (b) Cuba (c) North Korea (d) Former USSR
Answer: (a) USA.
Q8. India is best described as —
(a) A pure market economy (b) A centrally-planned economy (c) A mixed economy (d) A traditional economy
Answer: (c) A mixed economy.
Q9. “The government should provide free education to all” — this is an example of —
(a) Positive statement (b) Normative statement (c) Empirical fact (d) Equation
Answer: (b) Normative statement.
Q10. The slope of the PPF measures —
(a) Average cost (b) Marginal rate of transformation / opportunity cost (c) Marginal utility (d) Total revenue
Answer: (b) Marginal rate of transformation / opportunity cost.
Fill in the Blanks
Q1. Economics is the science of __________ under scarcity.
Answer: choice.
Q2. Microeconomics studies the behaviour of __________ economic units.
Answer: individual.
Q3. The Production Possibility Frontier is __________ to the origin.
Answer: concave.
Q4. A statement about “what ought to be” belongs to __________ economics.
Answer: normative.
Q5. In a __________ economy, both the public and private sectors coexist.
Answer: mixed.
True / False
Q1. Adam Smith gave the scarcity definition of economics. Answer: False — it was given by Lionel Robbins.
Q2. Macroeconomics studies the economy as a whole. Answer: True.
Q3. A point outside the PPF is currently attainable. Answer: False — it is unattainable with the existing resources and technology.
Q4. Opportunity cost is the value of the next-best alternative foregone. Answer: True.
Q5. In a centrally-planned economy, the price mechanism solves the central problems. Answer: False — it is the central planning authority that takes these decisions.
Glossary
| Term | Meaning |
|---|---|
| Economics | The social science that studies how individuals and societies allocate scarce resources among unlimited wants. |
| Microeconomics | The branch of economics that studies the behaviour of individual units — consumers, firms, single markets — and the determination of relative prices. |
| Macroeconomics | The branch of economics that studies aggregate variables such as national income, general price level, total employment and economic growth. |
| Scarcity | The fundamental fact that resources are limited relative to unlimited human wants. |
| Opportunity Cost | The value of the next-best alternative that must be sacrificed when a choice is made. |
| Production Possibility Frontier (PPF) | A curve showing all maximum combinations of two goods that can be produced with given resources and technology when fully and efficiently used. |
| Marginal Rate of Transformation (MRT) | The amount of one good that must be sacrificed to produce one extra unit of another; equals the slope of the PPF. |
| Positive Economics | Branch of economics dealing with statements of “what is” — facts and testable cause-effect relations. |
| Normative Economics | Branch of economics dealing with value judgments — “what ought to be.” |
| Centrally-planned Economy | An economy in which the State owns the means of production and a central authority decides what, how and for whom to produce. |
| Market Economy | An economy in which private individuals own resources and the central problems are solved through the price mechanism. |
| Mixed Economy | An economy that combines features of the market and centrally-planned systems; both private and public sectors operate side by side. |
| Economic Growth | An increase in productive capacity over time, shown by an outward shift of the PPF. |
Important Economists at a Glance
| Economist | Year | Key Contribution |
|---|---|---|
| Adam Smith | 1776 | Wealth of Nations; wealth definition; “Father of Economics” |
| Alfred Marshall | 1890 | Principles of Economics; welfare definition |
| Lionel Robbins | 1932 | Essay on the Nature and Significance of Economic Science; scarcity definition |
| Ragnar Frisch | 1933 | Coined the terms microeconomics and macroeconomics |
| J. M. Keynes | 1936 | General Theory; founder of modern macroeconomics |
| Paul A. Samuelson | 1948 | Modern textbook synthesis; popularised the PPF |
Quick Revision — Key Points
- Economics studies the allocation of scarce resources among unlimited wants.
- Adam Smith — wealth definition; Marshall — welfare definition; Robbins — scarcity definition.
- Microeconomics analyses individual units; macroeconomics analyses the economy as a whole.
- Central problems: what, how, for whom, fuller utilisation, growth.
- The PPF shows maximum producible combinations of two goods; it is concave to the origin due to rising opportunity cost.
- Opportunity cost = value of next-best alternative foregone; MRT = |slope of PPF|.
- Positive economics = “what is”; Normative economics = “what ought to be”.
- Three economy types: centrally-planned, market, mixed (India = mixed).
Exam Tips
- Always state the author and year for any definition (Smith — 1776, Marshall — 1890, Robbins — 1932).
- For 5-mark questions on the PPF, draw a labelled diagram showing axes, curve, an interior point and a point outside.
- Distinguish “scarcity” from “shortage”: scarcity is a permanent fact of life; shortage is a temporary mismatch in a particular market.
- Memorise the five central problems in the same order — what, how, for whom, fuller utilisation, growth.
- For “type of economy” questions, always cite at least one real-world example.
- Practise drawing a PPF and shifting it outward to demonstrate growth.
- Keep formulas clear: MRT = ΔY / ΔX = absolute slope of PPF.
For more ASSEB Class 11 Economics chapter notes and question-answer guides, keep visiting HSLC Guru — your trusted companion for board examination success.