Introduction to Economics: ISC Class 11 Notes and Basic Concepts

What Introduction to Economics is about

Weightage: Introduction to Economics is part of the unit Understanding Economics of the ISC Class XI Economics syllabus. CISCE gives no Class XI unit weightage for Economics: Paper I (Theory) carries 80 marks, and the school sets the paper.Source: CISCE ISC Economics syllabus, examination year 2028, Class XI paper pattern

Key concepts

Wealth definition (Adam Smith) and welfare definition (Alfred Marshall)

Adam Smith (*An Inquiry into the Nature and Causes of the Wealth of Nations*, 1776), the 'father of economics', described economics as the science of wealth: an enquiry into the nature and causes of the wealth of nations, how it is produced and how it is increased.

Features: wealth (material goods) is central; the 'economic man' acts from self-interest; growth of national wealth is the goal.

Criticisms: (1) gives wealth primary importance and man a secondary place; (2) the narrow meaning of wealth (material goods only) ignores services (a doctor's or teacher's work); (3) the self-interest view ignores other motives; critics (Carlyle, Ruskin) called it a 'dismal' or 'bread-and-butter' science.

Alfred Marshall (*Principles of Economics*, 1890) shifted the focus to human welfare: economics is a study of mankind in the ordinary business of life; it examines that part of individual and social action which is most closely connected with the attainment and use of the material requisites of well-being.

Features: man comes first, wealth is a means to welfare; only material welfare is studied; the 'ordinary business of life'; a social science.

Criticisms: (1) restricts economics to material welfare, while non-material services (teaching, medicine) also satisfy wants; (2) welfare is subjective and cannot be measured; some activities studied in economics (producing alcohol or tobacco) reduce welfare; (3) it makes economics a normative judge of welfare.

Worked example

Suppose a singer earns ₹50 lakh a year performing at concerts. Would Adam Smith's and Marshall's definitions include her work in economics? Explain. [2 marks]

Try it first, then show the solutionSolution

1. Both definitions centre on material goods (wealth or material requisites of well-being).
2. A singer produces a non-material service, so their definitions would leave it out; this is one of the criticisms of both.

Answer: Strictly no: both focus on material goods, which is why they are criticised for ignoring services.

Scarcity definition (Robbins) and growth definition (Samuelson)

Lionel Robbins (*An Essay on the Nature and Significance of Economic Science*, 1932) defined economics as the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.

Features:

• Unlimited ends (wants): wants keep arising.
• Scarce means: resources are limited relative to wants.
• Alternative uses: the same resource can serve many ends (land for rice or for a factory).
• Wants differ in urgency, so choice is needed. Economics becomes a science of choice, and positive (neutral between ends).

Criticisms: (1) ignores growth: treats resources as given, though they can grow; (2) makes economics too neutral, refusing to judge what is good or bad for society; (3) ignores macro problems such as unemployment, where resources lie idle even though they are scarce.

Paul Samuelson (*Economics*, 1948) gave a growth-oriented definition: economics is the study of how people and society choose, with or without money, to employ scarce productive resources that could have alternative uses, to produce various commodities over time and distribute them for consumption now and in the future among persons and groups.

Features: includes scarcity and choice; adds time and growth; covers production, distribution and consumption; applies with or without money; dynamic.

Criticism: it is broad and somewhat descriptive; still treats choice as the central problem.

Worked example

Suppose a farmer has one hectare of land that can grow either 40 quintals of wheat or 25 quintals of mustard. Which features of Robbins's definition does this illustrate? [2 marks]

Try it first, then show the solutionSolution

1. Land is a scarce means (only one hectare).
2. It has alternative uses (wheat or mustard), so the farmer must choose according to the urgency of his ends.

Answer: Scarce means with alternative uses, and the need for choice.

Micro and macro economics

Microeconomics studies the behaviour of individual units: a consumer, a firm, an industry, the price of a single good, the wage in one occupation. It is also called price theory.

Macroeconomics studies the economy as a whole: national income, aggregate demand and aggregate supply, general price level, total employment, money and banking, business cycles, growth. It is also called income theory.

Basis	Micro	Macro
Scope	Individual units	The whole economy
Central problem	Price determination and allocation of resources	Determination of income, output and employment
Tools	Demand and supply of a good	Aggregate demand and aggregate supply
Assumption	Other things (macro variables) constant	Distribution of income given
Examples	Price of onions; output of a firm	Inflation; unemployment; GDP

The two are interdependent: what is true for one unit may not hold for all (the fallacy of composition: one person saving more is wise, but if everyone saves more, demand and incomes may fall).

Worked example

Classify as micro or macro: (i) the price of tomatoes in Pune; (ii) India's unemployment rate; (iii) the wages of software engineers; (iv) the general price level. [2 marks]

Try it first, then show the solutionSolution

1. (i) and (iii) concern a single good or a single factor market: micro.
2. (ii) and (iv) concern the whole economy: macro.

Answer: Micro: (i), (iii). Macro: (ii), (iv).

Human wants, factors of production and factor incomes

Human wants are desires backed by the willingness and ability to pay (effective desires). Features: unlimited; recurring; competitive; complementary; varying in urgency; satiable individually; influenced by income, habit, fashion and advertising.

Classification of wants:

• Necessities: (a) for existence (food, shelter); (b) for efficiency (nutritious food, books for a student); (c) conventional (customs, social obligations).
• Comforts: make life easier and pleasanter (a fan, a cooler).
• Luxuries: superfluous, give prestige (a diamond necklace, a sports car).

The class depends on the person, place and time: a car is a luxury for one family and a necessity for a doctor.

Factors of production and their rewards (factor incomes):

Factor	Meaning	Reward
Land	All free gifts of nature	Rent
Labour	Human effort, physical or mental, for a reward	Wages
Capital	Man-made means of further production	Interest
Entrepreneur (organisation)	Combines the factors and bears risk	Profit

Worked example

Suppose a bakery pays ₹2,40,000 for the shop's land rent, ₹6,00,000 to workers, ₹90,000 interest on a loan for ovens, and its owner keeps ₹3,70,000 after all costs. Name each factor income and find total factor income. [2 marks]

Try it first, then show the solutionSolution

1. Rent ₹2,40,000 (land); wages ₹6,00,000 (labour); interest ₹90,000 (capital); profit ₹3,70,000 (entrepreneur).
2. Total = 2,40,000 + 6,00,000 + 90,000 + 3,70,000 = ₹13,00,000.

Answer: Rent, wages, interest and profit; total factor income ₹13,00,000.

Utility: types, features, total and marginal utility

Utility is the want-satisfying power of a good or service. It is subjective (differs between persons), relative (changes with time and place), ethically neutral (a cigarette has utility for a smoker), not the same as usefulness or pleasure, and measured (in the cardinal approach) in imaginary units, utils.

Types (forms) of utility created by production: form utility (wood into furniture), place utility (transport to where it is wanted), time utility (storage till it is needed), service utility (a teacher's lesson), possession (ownership) utility (a trader passing goods to the user), and knowledge utility (advertising informs buyers).

Total utility (TU): the total satisfaction from consuming all units. Marginal utility (MU): the change in total utility from one more unit: MU_n = TU_n − TU_(n−1).

Law of diminishing marginal utility: as a consumer consumes more units of a good in succession, other things being equal, the marginal utility from each additional unit falls.

• TU rises while MU is positive, is maximum when MU = 0 (point of satiety), and falls when MU is negative.
• Assumptions: units are standard and homogeneous; consumption is continuous; tastes, income and prices of other goods constant; the consumer is rational.

Worked example

Suppose the total utility from glasses of juice is: 1 → 10, 2 → 18, 3 → 24, 4 → 28, 5 → 30, 6 → 30, 7 → 28 utils. Find marginal utility for each glass and the point of satiety. [3 marks]

Try it first, then show the solutionSolution

1. MU = 10, 8, 6, 4, 2, 0, −2.
2. TU is maximum (30) at the 6th glass where MU = 0: point of satiety.
3. After that, MU is negative and TU falls.

Answer: MU: 10, 8, 6, 4, 2, 0, −2; satiety at the 6th glass (TU 30).

Price, value, real vs nominal, wealth and welfare

• Value in economics usually means value in exchange: the quantity of other goods a good can command. (Value in use, like air, may be high while exchange value is nil.)
• Price is value expressed in money.
• Nominal value is measured at current prices; real value is adjusted for changes in the price level: Real value = Nominal value × 100 ÷ Price index.
• Wealth: goods that have utility, scarcity, transferability and externality (are outside the person). Personal wealth: owned by individuals (house, shares, savings). Social (national) wealth: owned by the community (roads, parks, rivers, public buildings) plus the total personal wealth of citizens.
• Welfare: well-being or happiness. Economic welfare is the part that can be measured in money (Pigou); social welfare is the welfare of society as a whole, including non-economic factors (health, safety, freedom).
• Relation between wealth and welfare: wealth is a means to welfare. More wealth generally raises welfare, but not always: wealth spent on harmful goods, wealth very unequally distributed, or earned through pollution or long working hours may reduce welfare.

Worked example

Suppose a worker's monthly salary rises from ₹40,000 to ₹48,000 while the price index rises from 100 to 125. Find the real salary and say whether he is better off. [2 marks]

Try it first, then show the solutionSolution

1. Real salary = 48,000 × 100 ÷ 125 = ₹38,400 at base-year prices.
2. Real salary has fallen from ₹40,000 to ₹38,400, so he is worse off despite a higher money salary.

Answer: Real salary ₹38,400; he is worse off by ₹1,600 in real terms.

Barter and money economy; market and its size

Barter economy: goods are exchanged directly for goods (C–C exchange).

Difficulties of barter: (1) lack of double coincidence of wants; (2) no common measure of value; (3) indivisibility of some goods; (4) difficulty of storing wealth (perishable goods); (5) no standard for deferred payments.

Money economy: money acts as a medium of exchange, measure of value, store of value and standard of deferred payments, removing these difficulties and making specialisation and trade possible.

Market: any arrangement by which buyers and sellers of a commodity come into contact (physically, by phone or online) to buy and sell at a price. It does not need a fixed place.

Size (extent) of a market depends on: the nature of the commodity (durable, portable, uniform goods have wide markets; perishables like milk, local ones); demand (wide demand → wide market); transport and communication; money and banking; peace and security; government policy (tariffs, quotas); division of labour. Markets may be local, regional, national or international, and very short, short or long period by time.

Worked example

Suppose a potter wants rice and a rice farmer wants shoes, not pots. Which difficulty of barter arises, and how does money solve it? [2 marks]

Try it first, then show the solutionSolution

1. The farmer does not want pots, so there is no double coincidence of wants.
2. With money, the potter sells pots to anyone who wants them and pays the farmer in money; the farmer then buys shoes.

Answer: Lack of double coincidence of wants; money as a medium of exchange separates buying from selling.

Capital, investment and saving

• Capital: man-made goods used to produce further goods (machines, tools, buildings, raw materials). It is a stock at a point of time. Fixed capital (lasts many periods) vs working capital (used up in one period).
• Investment: addition to the stock of capital during a period: capital formation. It is a flow. Gross investment includes replacement of worn-out capital; net investment = gross investment − depreciation. (Buying old shares is not investment in this sense; it only transfers ownership.)
• Income: the flow of money or goods earned over a period (wages, rent, interest, profit). Production creates utility; consumption uses up goods and services to satisfy wants.
• Saving: the part of income not consumed: Saving = Income − Consumption. Individual saving is a household's saving; aggregate saving is the total saving of households, firms and government in the economy.
• Business cycle: alternating periods of expansion (boom) and contraction (recession, depression) in economic activity. Aggregate demand is the total planned spending on goods and services in the economy; aggregate supply is the total output available.

Worked example

Suppose a firm's capital stock was ₹50 lakh on 1st April. During the year it bought machines worth ₹12 lakh, and existing machines wore out by ₹3 lakh. Find gross investment, net investment and the closing capital stock. [2 marks]

Try it first, then show the solutionSolution

1. Gross investment = ₹12 lakh; net investment = 12 − 3 = ₹9 lakh.
2. Closing capital stock = 50 + 9 = ₹59 lakh.

Answer: Gross investment ₹12 lakh; net investment ₹9 lakh; capital stock ₹59 lakh.

Introduction to Economics in real life

Each concept, met in an everyday situation. Read the situation, answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Topics in this chapter

• Definitions of Economics: Smith, Marshall, Robbins, Samuelson, and Micro and Macro Economics
• Wants, Factors of Production, Factor Incomes and Utility

Introduction to Economics: key facts

Marginal utility

MU_n = TU_n − TU_(n−1)

TU is maximum where MU = 0.

Total utility

TU_n = MU_1 + MU_2 + … + MU_n

Real value

Real value = Nominal value × 100 ÷ Price index

Saving

Saving = Income − Consumption

Net investment

Net investment = Gross investment − Depreciation

Closing capital stock = Opening stock + Net investment.

Introduction to Economics: diagrams to practise

Practise each one on paper: draw it from the checklist, then tick off every label.

How the school exam asks Introduction to Economics

The question patterns to expect, and the method that works for each.

Tricks to remember Introduction to Economics

Short memory aids. Say each one aloud once, then use it on a question the same day.

• Four authors, four Ws

  Smith: Wealth; Marshall: Welfare; Robbins: Want vs scarce means (choice); Samuelson: Wider (growth over time).

  Use it when: Recalling the definitions.

• Factor incomes: R-W-I-P

  Rent (land), Wages (labour), Interest (capital), Profit (entrepreneur).

  Use it when: Factors of production.

• Utility types: 'FPT SPK'

  Form, Place, Time, Service, Possession, Knowledge.

  Use it when: Types of utility.

Introduction to Economics: exam-level solved questions

Ordered from exam level to HOTS. Cover the solution, write your own, then compare step by step.

Case-study practice (Section C style)

Read the situation, then answer every part. In a school exam set on the board pattern this is a 6-mark question split into 2 + 2 + 2 marks.

Where the marks are

How a typical answer is split into step marks. Show every step: a right final answer alone rarely earns full marks.

Where students lose marks in Introduction to Economics

The slips examiners see most often, and what to write instead.

• ✗Mistake: Misquoting definitions

  The key words ('scarce means which have alternative uses', 'material requisites of well-being') carry the marks; a loose paraphrase misses them.

  ✓Do this: Learn the key phrase of each definition word for word, then explain in your own words.

  Usually costs: 1 mark per definition.

• ✗Mistake: Writing general criticisms for every definition

  Each definition has its own weakness (Smith: wealth over man; Marshall: material only; Robbins: ignores growth and unemployment).

  ✓Do this: Pair each criticism with the definition it answers.

  Usually costs: 1-2 marks.

• ✗Mistake: Saying total utility is maximum when marginal utility is maximum

  TU is maximum when MU is zero; MU is highest at the first unit.

  ✓Do this: Remember: MU = 0 ↔ TU peak.

  Usually costs: 1 mark.

• ✗Mistake: Treating buying shares or keeping a bank deposit as investment

  In economics, investment means addition to the physical stock of capital; financial transactions only transfer ownership or are saving.

  ✓Do this: Ask: has a new machine, building or stock of goods been added?

  Usually costs: 1 mark.

• ✗Mistake: Confusing money income with real income

  A higher money income can buy less if prices rise faster.

  ✓Do this: Always deflate by the price index: Real = Nominal × 100 ÷ Price index.

  Usually costs: 1 mark.

Practice questions on Introduction to Economics

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

1. Q1 · 1 mark · MCQExam level

   Who is called the father of economics?
   (a) Alfred Marshall
   (b) Adam Smith
   (c) J. M. Keynes
   (d) Lionel Robbins

   Hint

   Wealth of Nations.

   Answer

   (b) Adam Smith.

2. Q2 · 2 marks · Short answerExam level

   Distinguish between necessities, comforts and luxuries with one example each.

   Hint

   Existence, ease, prestige.

   Answer

   Necessities are essential for existence or efficiency (food, books for a student). Comforts make life easier (a cooler). Luxuries are superfluous and give prestige (a diamond ring). The class depends on the person and time.

3. Q3 · 2 marks · Short answerExam level

   State four difficulties of the barter system.

   Hint

   Coincidence, measure, division, storage.

   Answer

   Lack of double coincidence of wants; no common measure of value; indivisibility of goods; difficulty of storing value (also no standard of deferred payments).

4. Q4 · 2 marks · Short answerHarder exam level

   Suppose total utilities from successive slices of pizza are 20, 35, 45, 50, 50, 45. Find marginal utilities and state where the law of diminishing marginal utility begins to apply and where the point of satiety is.

   Hint

   Subtract successive TU.

   Answer

   MU = 20, 15, 10, 5, 0, −5. MU diminishes from the second slice onwards; satiety at the 5th slice (TU 50, MU 0).

5. Q5 · 2 marks · Short answerHarder exam level

   Suppose an economy's gross investment is ₹8,40,000 crore and depreciation ₹1,90,000 crore. Find net investment. If net investment were negative, what would that mean?

   Hint

   Net = Gross − Depreciation.

   Answer

   Net investment = ₹6,50,000 crore. Negative net investment would mean the capital stock is shrinking: new capital is less than what wears out.

6. Q6 · 2 marks · Short answerHarder exam level

   Distinguish between personal wealth and social wealth with two examples each.

   Hint

   Ownership.

   Answer

   Personal wealth is owned by individuals: a house, shares. Social wealth belongs to the community: roads, public parks (and includes the personal wealth of all citizens).

7. Q7 · 4 marks · Short answerHOTS / competency

   Explain the fallacy of composition with an example, and say why it shows the need for macroeconomics.

   Hint

   Saving.

   Answer

   What is true for one unit may be false for all. If one family saves more, it becomes richer; if all families save more at once, total spending falls, firms sell less, incomes and employment fall, and total saving may not rise (paradox of thrift). Micro reasoning cannot predict this; it needs the study of aggregates: macroeconomics.

8. Q8 · 2 marks · Short answerHOTS / competency

   Suppose a consumer is willing to pay ₹40 for the first mango, ₹32 for the second, ₹25 for the third and ₹18 for the fourth. The market price is ₹25. How many mangoes will she buy and why? Link your answer to diminishing marginal utility.

   Hint

   Buy while MU (in rupees) ≥ price.

   Answer

   Three mangoes: for the first three, her marginal utility (willingness to pay) is at least ₹25; the fourth is worth only ₹18 to her, less than its price. Diminishing MU makes her stop buying.

9. Q9 · 4 marks · Short answerHarder exam level

   Give two features of the size of a market for (a) milk and (b) gold, and explain the difference.

   Hint

   Durability, portability, value.

   Answer

   Milk: perishable and bulky for its value, so its market is local and short-period. Gold: durable, portable, high value per unit and uniform, so it has a national or international market. The nature of the commodity decides the size of the market.

10. Q10 · 6 marks · Long answerHOTS / competency

    Is economics a science of choice? Answer with reference to two definitions.

    Hint

    Robbins and Samuelson.

    Answer

    Yes, broadly. Robbins: scarce means with alternative uses and unlimited ends force a choice, so economics studies how people choose. Samuelson: people and society choose how to employ scarce resources to produce goods over time and distribute them now and in future, adding growth to choice. But Marshall's welfare view reminds us that economics also judges how choices affect well-being, and Keynesian macro problems (unemployment) show that sometimes resources lie idle, so choice is not the whole story.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1. 1.Robbins's definition rests on which three features?Show answer

   Unlimited ends, scarce means, alternative uses.

2. 2.MU when TU is maximum?Show answer

   Zero.

3. 3.Real income formula?Show answer

   Nominal income × 100 ÷ Price index.

4. 4.Reward of capital?Show answer

   Interest.

5. 5.Net investment?Show answer

   Gross investment − Depreciation.

6. 6.Micro economics is also called?Show answer

   Price theory.

Quick revision checklist

The night before the exam: can you do each of these without looking?

• ☐Smith 1776: wealth; Marshall 1890: material welfare; Robbins 1932: scarcity and choice; Samuelson 1948: growth over time.
• ☐Micro: individual units (price theory); macro: whole economy (income theory).
• ☐Wants: necessities, comforts, luxuries.
• ☐Land-rent, labour-wages, capital-interest, entrepreneur-profit.
• ☐MU = ΔTU; TU maximum at MU = 0.
• ☐Real value = Nominal × 100 ÷ Price index.
• ☐Barter fails without double coincidence of wants.
• ☐Investment = addition to capital stock; saving = income − consumption.

Introduction to Economics: frequently asked questions