Introduction to Micro Economics — Exercise Solutions
| **Class 11 | TN State Board | Economics | Chapter 1** |
|---|
Welcome to the complete exercise solutions for Chapter 1: Introduction to Micro Economics. This guide covers every question from the Samacheer Kalvi textbook with detailed explanations, comparisons, and exam tips.
1. How to Use This Page
This solutions page is organised to help you learn, not just memorise answers:
- Read the Key Concepts section first for a quick recap of the chapter.
- Attempt each exercise on your own before reading the solution.
- Check your answers against the detailed explanations provided here.
- Pay attention to the "Common Mistakes" and "Exam Checklist" sections at the end — they can save you marks.
Each section follows the exact pattern of the Samacheer Kalvi textbook exercises. MCQs, fill-in-the-blanks, true or false, match the following, brief answers, and detailed answers are all covered with thorough explanations.
2. Key Concepts (Quick Recap)
Definition of Micro Economics
Micro Economics is the study of economic behaviour of individual units — a consumer, a firm, or an industry. The term "Micro" comes from the Greek word "Mikros" meaning small. It was popularised by Prof. Ragnar Frisch and later developed extensively by Alfred Marshall.
Scope of Micro Economics
| Area | Description |
|---|
| Theory of Consumer Behaviour | Studies how consumers allocate income to maximise satisfaction (utility) |
| Theory of Production | Examines how firms combine inputs to produce output efficiently |
| Theory of Product Pricing | Analyses how prices of goods are determined in different market structures |
| Theory of Factor Pricing | Deals with how prices of factors of production (land, labour, capital, organisation) are determined |
| Theory of Economic Welfare | Evaluates how resource allocation affects social well-being |
Micro Economics vs Macro Economics
| Basis | Micro Economics | Macro Economics |
|---|
| Meaning | Study of individual economic units | Study of the economy as a whole |
| Focus | Single consumer, firm, or market | Aggregate variables like national income, employment |
| Method | Simplifying (microscopic) | Aggregating (macroscopic) |
| Variables | Individual prices, individual income | General price level, national income |
| Central Problem | Price determination | Determination of income and employment |
| Example | Price of rice in a local market | Inflation rate in India |
| Pioneers | Alfred Marshall | J.M. Keynes |
Positive Economics vs Normative Economics
| Basis | Positive Economics | Normative Economics |
|---|
| Meaning | Deals with "what is" | Deals with "what ought to be" |
| Nature | Objective and factual | Subjective and value-based |
| Verification | Can be verified with data | Cannot be verified — depends on values |
| Example | "India's GDP grew by 7% last year" | "India should focus on reducing inequality" |
Central Problems of an Economy
| Problem | Description | Key Question |
|---|
| What to produce? | Deciding which goods and services to produce and in what quantity | Which commodities? How much of each? |
| How to produce? | Choosing the technique of production | Labour-intensive or capital-intensive? |
| For whom to produce? | Deciding the distribution of output among people | How is the national product shared? |
Production Possibility Curve (PPC)
- A PPC shows all possible combinations of two goods that can be produced with given resources and technology.
- It is concave to the origin because of increasing marginal opportunity cost.
- Points on the curve indicate full employment of resources.
- Points inside the curve indicate underutilisation of resources.
- Points outside the curve are unattainable with current resources and technology.
- Rightward shift of PPC indicates economic growth.
3. I. Choose the Best Answer (MCQs)
1. The term 'Micro' is derived from the Greek word ______
Answer
- (a) Makros
- (b) Mikros ✅
- (c) Metron
- (d) Micros
Answer(b) Mikros
ExplanationThe word "Micro" originates from the Greek word "Mikros" which means "small." Micro Economics therefore studies small, individual economic units like a consumer, a firm, or an industry, as opposed to the economy as a whole.
2. Who is considered the father of Micro Economics?
Answer
- (a) Adam Smith
- (b) J.M. Keynes
- (c) Alfred Marshall ✅
- (d) Lionel Robbins
Answer(c) Alfred Marshall
ExplanationAlfred Marshall is regarded as the father of Micro Economics because he developed the theory of individual markets, consumer behaviour, and price determination. J.M. Keynes, on the other hand, is the father of Macro Economics.
3. The Production Possibility Curve is concave to the origin because of ______
Answer
- (a) Constant opportunity cost
- (b) Increasing marginal opportunity cost ✅
- (c) Decreasing opportunity cost
- (d) Zero opportunity cost
Answer(b) Increasing marginal opportunity cost
ExplanationThe PPC is concave (bowed outward) because resources are not perfectly adaptable to the production of both goods. As more of one good is produced, increasingly more of the other good must be sacrificed. This is the law of increasing marginal opportunity cost.
4. Which of the following is a central problem of an economy?
Answer
- (a) What to produce ✅
- (b) How to consume
- (c) When to distribute
- (d) Where to save
Answer(a) What to produce
ExplanationThe three central problems of every economy are: (1) What to produce, (2) How to produce, and (3) For whom to produce. "What to produce" addresses the question of which goods and services should be produced and in what quantities, given limited resources.
5. Positive economics deals with ______
Answer
- (a) What ought to be
- (b) What is ✅
- (c) Moral judgments
- (d) Value judgments
Answer(b) What is
ExplanationPositive economics is objective and fact-based. It deals with "what is" — statements that can be verified with data. Normative economics, in contrast, deals with "what ought to be" and involves value judgments.
6. Opportunity cost refers to ______
Answer
- (a) The total cost of production
- (b) The money cost of a product
- (c) The value of the next best alternative foregone ✅
- (d) The fixed cost incurred by a firm
Answer(c) The value of the next best alternative foregone
ExplanationOpportunity cost is the value of the next best alternative that is given up when a choice is made. It is not about monetary cost alone but about the benefit foregone from the best alternative use of a resource.
7. A point inside the Production Possibility Curve indicates ______
Answer
- (a) Full employment of resources
- (b) Underutilisation of resources ✅
- (c) Unattainable production level
- (d) Efficient allocation
Answer(b) Underutilisation of resources
ExplanationA point inside the PPC means the economy is not using all its available resources efficiently. This could be due to unemployment, idle factories, or other inefficiencies. Points on the curve represent full employment, and points outside are unattainable.
4. II. Fill in the Blanks
1. The word "Micro" is derived from the Greek word Mikros.
2. Alfred Marshall is known as the father of Micro Economics.
3. The problem of "For whom to produce" relates to the distribution of national product among the people.
4. Micro Economics is also known as Price Theory.
5. Macro Economics is also known as Income and Employment Theory.
6. The Production Possibility Curve is also called the Transformation Curve.
7. Opportunity cost is the value of the next best alternative foregone.
8. Positive economics deals with "what is" and can be verified with facts.
9. Normative economics deals with "what ought to be" and involves value judgments.
10. A point outside the PPC is unattainable with the given resources and technology.
11. A rightward shift of the PPC indicates economic growth.
12. The problem "How to produce" is related to the choice of technique of production.
5. III. True or False
1. Micro Economics studies the economy as a whole.
AnswerFalse
Correction: Micro Economics studies individual economic units such as a consumer, a firm, or an industry. It is Macro Economics that studies the economy as a whole.
2. Alfred Marshall is the father of Macro Economics.
AnswerFalse
Correction: Alfred Marshall is the father of Micro Economics. J.M. Keynes is considered the father of Macro Economics.
3. The PPC is concave to the origin due to increasing marginal opportunity cost.
AnswerTrue
The PPC bows outward because resources are not equally efficient in producing all goods. As we shift resources from one good to another, we must give up increasing amounts of the first good to produce additional units of the second.
4. Opportunity cost applies only to monetary expenditures.
AnswerFalse
Correction: Opportunity cost is not limited to money. It includes the value of the next best alternative foregone in any decision, whether it involves time, effort, or any other resource. For example, the opportunity cost of attending college is not just tuition fees but also the income foregone from not working during those years.
5. Normative statements can be verified with data.
AnswerFalse
Correction: Normative statements involve value judgments and opinions about what "ought to be." They cannot be verified with data. Only positive statements, which describe "what is," can be tested and verified with facts and data.
6. A point on the PPC indicates full and efficient utilisation of resources.
AnswerTrue
When an economy operates on the PPC, it means all available resources are being fully and efficiently utilised to produce the combination of goods represented by that point.
6. IV. Match the Following
Match the Following — Set A
| Column A | Column B | Match |
|---|
| 1. Micro Economics | a. J.M. Keynes | 1 — e (Price Theory) |
| 2. Macro Economics | b. What ought to be | 2 — a (J.M. Keynes) |
| 3. Alfred Marshall | c. What is | 3 — f (Father of Micro Economics) |
| 4. Positive Economics | d. Next best alternative | 4 — c (What is) |
| 5. Normative Economics | e. Price Theory | 5 — b (What ought to be) |
| 6. Opportunity Cost | f. Father of Micro Economics | 6 — d (Next best alternative) |
Match the Following — Set B
| Column A | Column B | Match |
|---|
| 1. What to produce | a. Choice of technique | 1 — c (Type and quantity of goods) |
| 2. How to produce | b. Distribution of output | 2 — a (Choice of technique) |
| 3. For whom to produce | c. Type and quantity of goods | 3 — b (Distribution of output) |
| 4. PPC concave | d. Economic growth | 4 — f (Increasing opportunity cost) |
| 5. Rightward shift of PPC | e. Unattainable production | 5 — d (Economic growth) |
| 6. Point outside PPC | f. Increasing opportunity cost | 6 — e (Unattainable production) |
7. V. Answer Briefly (2-Mark Questions)
1. Define Micro Economics.
Answer
Micro Economics is the branch of economics that studies the economic behaviour of individual units such as consumers, firms, and industries. It analyses how these individual units make decisions regarding the allocation of scarce resources and how they interact in specific markets. The term "Micro" comes from the Greek word "Mikros," meaning small. Alfred Marshall is regarded as the father of Micro Economics.
2. What is Opportunity Cost?
Answer
Opportunity cost is defined as the value of the next best alternative that is foregone when a choice is made. Since resources are limited, choosing one option necessarily means giving up another. For example, if a farmer uses land to grow rice instead of wheat, the opportunity cost is the wheat production that was sacrificed. Opportunity cost is a fundamental concept in economics that helps in rational decision-making.
3. Mention the central problems of an economy.
Answer
The three central problems of every economy are:
1. What to produce? — Which goods and services should be produced and in what quantities. 2. How to produce? — What technique of production should be used (labour-intensive or capital-intensive). 3. For whom to produce? — How should the produced goods and services be distributed among the members of society.
These problems arise because resources are limited while human wants are unlimited.
4. Distinguish between Positive Economics and Normative Economics.
Answer
Positive Economics deals with "what is" — it makes objective statements that can be verified with data. For example, "The price of rice is Rs. 50 per kg" is a positive statement. Normative Economics deals with "what ought to be" — it involves value judgments and opinions. For example, "The price of rice should be lower" is a normative statement. Positive economics is factual, while normative economics is opinion-based.
5. What is a Production Possibility Curve?
Answer
A Production Possibility Curve (PPC) is a diagram that shows all possible combinations of two goods that an economy can produce with given resources and technology, assuming full and efficient utilisation of resources. The PPC is concave to the origin due to increasing marginal opportunity cost. Points on the curve represent efficient production, points inside represent underutilisation, and points outside represent unattainable production levels.
8. VI. Answer in Detail (5-Mark Questions)
1. Explain the scope of Micro Economics.
Answer
The scope of Micro Economics covers several important areas of economic study at the individual level:
1. Theory of Consumer Behaviour: This area studies how individual consumers make decisions about spending their income on various goods and services to maximise satisfaction. It includes concepts like utility, marginal utility, consumer equilibrium, and the law of demand.
2. Theory of Production: This deals with how firms decide on the combination of inputs (land, labour, capital, and organisation) to produce output efficiently. It studies the relationship between inputs and outputs, including the laws of returns and economies of scale.
3. Theory of Product Pricing: This analyses how the prices of goods and services are determined in different market structures — perfect competition, monopoly, monopolistic competition, and oligopoly. Price determination is the core of Micro Economics, which is why it is also called Price Theory.
4. Theory of Factor Pricing: Micro Economics also studies how the prices of factors of production are determined — rent for land, wages for labour, interest for capital, and profit for organisation. This is also known as the theory of distribution.
5. Theory of Economic Welfare: This area evaluates how the allocation of resources affects social welfare. It examines whether the current distribution of resources leads to maximum social welfare and suggests improvements.
Thus, Micro Economics provides a comprehensive framework for understanding individual economic behaviour and market functioning.
2. Explain the central problems of an economy with suitable illustrations.
Answer
Every economy, whether developed or developing, capitalist or socialist, faces three fundamental economic problems. These arise because resources are scarce relative to unlimited human wants.
1. What to produce?
Answer
This problem has two dimensions: (a) What types of goods should be produced — consumer goods or capital goods? and (b) In what quantities should each good be produced? Since resources are limited, an economy cannot produce everything it wants. For example, should India produce more food grains to feed its population or more defence equipment to protect its borders? If an economy decides to produce more of one good, it must sacrifice some of the other.
2. How to produce?
Answer
This problem relates to the choice of technique of production. There are two broad techniques: (a) Labour-intensive technique — using more labour and less capital, and (b) Capital-intensive technique — using more capital and less labour. In a labour-abundant country like India, labour-intensive techniques may be preferred to generate employment, while a capital-rich country may prefer capital-intensive techniques for greater efficiency.
3. For whom to produce?
Answer
This problem relates to the distribution of the national product among the people. Who should get how much? Should the distribution be based on ability to pay, or should the government ensure a minimum share for all? In a market economy, goods are distributed to those who can pay, while in a socialist economy, the government tries to ensure equitable distribution.
These three problems are universal and fundamental. How they are resolved depends on the type of economic system — market economy, command economy, or mixed economy.
3. Explain the Production Possibility Curve with a diagram and discuss its features.
Answer
The Production Possibility Curve (PPC) is a graphical representation that shows all possible combinations of two goods that an economy can produce with given resources and technology, assuming full and efficient utilisation of all resources.
Assumptions of PPC:
1. The economy produces only two goods. 2. The quantity and quality of resources are fixed. 3. Technology remains constant. 4. All resources are fully and efficiently employed.
Illustration: Suppose an economy can produce only two goods — Food and Cloth. With all resources devoted to Food, it can produce 100 units. With all resources devoted to Cloth, it can produce 50 units. Various combinations between these extremes are possible:
| Combination | Food (units) | Cloth (units) |
|---|
| A | 100 | 0 |
| B | 80 | 10 |
| C | 60 | 20 |
| D | 40 | 30 |
| E | 20 | 40 |
| F | 0 | 50 |
When these combinations are plotted on a graph with Food on the X-axis and Cloth on the Y-axis and connected, we get the PPC — a concave curve.
Features of PPC:
1. Concave to the origin: The PPC bows outward because of increasing marginal opportunity cost. As more of one good is produced, increasingly more of the other must be sacrificed.
2. Downward sloping: The PPC slopes downward from left to right because to produce more of one good, some units of the other must be given up (scarcity and trade-off).
3. Points on the curve: Represent full and efficient utilisation of resources. The economy is producing at its maximum potential.
4. Points inside the curve: Represent underutilisation of resources — there is unemployment or inefficiency.
5. Points outside the curve: Are unattainable with current resources and technology. They represent production levels that cannot be achieved.
6. Shift of the PPC: A rightward shift indicates economic growth (increase in resources or improvement in technology). A leftward shift indicates economic decline.
The PPC is a powerful tool that illustrates the concepts of scarcity, choice, and opportunity cost in a simple visual manner.
9. Common Mistakes to Avoid
| Mistake | Correction |
|---|
| Confusing Micro Economics with Macro Economics | Micro studies individual units (consumer, firm); Macro studies aggregates (national income, employment) |
| Writing "Micro" comes from "Micros" | The correct Greek origin is "Mikros" |
| Saying Alfred Marshall is the father of Macro Economics | Marshall is the father of Micro Economics; J.M. Keynes is the father of Macro Economics |
| Stating opportunity cost is only about money | Opportunity cost is the value of the next best alternative — it can involve time, effort, or any resource |
| Drawing the PPC as a straight line | The PPC is concave (bowed outward) due to increasing marginal opportunity cost |
| Confusing Positive and Normative statements | Positive = "what is" (factual); Normative = "what ought to be" (value judgment) |
| Saying "For whom to produce" is about technique of production | "For whom to produce" is about distribution; "How to produce" is about technique |
| Saying points inside the PPC mean maximum output | Points inside the PPC indicate underutilisation; points on the curve mean maximum output |
| Writing opportunity cost as the sum of all alternatives | Opportunity cost is only the value of the next best alternative, not all alternatives |
| Confusing shift of PPC with movement along PPC | A shift (rightward/leftward) indicates change in resources or technology; movement along the curve indicates reallocation of existing resources |
10. Exam Checklist
Before you head into the exam, make sure you can tick off every item below:
- [ ] I can define Micro Economics and explain its scope (5 areas).
- [ ] I know the Greek origin of "Micro" — Mikros (meaning small).
- [ ] I can distinguish Micro Economics from Macro Economics on at least 4 parameters.
- [ ] I can distinguish Positive Economics from Normative Economics with examples.
- [ ] I can list and explain all three central problems of an economy with illustrations.
- [ ] I can define Opportunity Cost and give a real-world example.
- [ ] I can draw and explain the PPC, including all its features.
- [ ] I can explain why the PPC is concave to the origin (increasing marginal opportunity cost).
- [ ] I can differentiate between points on, inside, and outside the PPC.
- [ ] I can explain what a rightward shift of the PPC indicates (economic growth).
- [ ] I know that Alfred Marshall is the father of Micro Economics and J.M. Keynes is the father of Macro Economics.
- [ ] I can identify whether a statement is Positive or Normative.
- [ ] I can correctly match terms related to this chapter (PPC names, economists, economic problems).
- [ ] I have reviewed the common mistakes table and can avoid those errors.
All the best for your exams! Remember: understanding concepts deeply is far more valuable than rote memorisation. Practice drawing the PPC and explaining it in your own words.
