Class 12 Economics (Macroeconomics) Chapter 1 Introduction Notes in English

Covers T.R. Jain & V.K. Ohri (2026-27) ch 1. Based on NCERT Introductory Macroeconomics, Chapter 1 (Reprint 2026-27) and the CBSE curriculum 2026-27.

1 What is Macroeconomics?

Macroeconomics studies the big questions about the “health” of a country’s economy as a whole, questions that concern every citizen.

1.1 The basic questions of macroeconomics

1.2 Everything tends to move together

• Seen as a whole, the output levels of all goods and services tend to move together
• Example: when food grain output grows, the output of industrial goods generally rises too
• Within industrial goods, outputs of different goods also rise or fall together
• Prices of different goods and services also tend to rise or fall together
• Employment in different production units also goes up or down together

1.3 The representative good: a simplifying trick

Because output, prices and employment are so closely related, we need not study every good separately (at the disaggregated level).

• The simplification works because what happens to prices, interest, wages and profits for one commodity more or less also happens for the others
• This is clearest when the variables change fast:
  • Inflation: prices going up
  • Depression: employment and production levels going down
• At such times, the movements for individual commodities are usually in the same direction as the aggregates for the whole economy

1.4 Limits of the simplification: sectors and three goods

• Sometimes we depart from the simplification, because the economy is made of distinct sectors
• The interdependence (or even rivalry) of two sectors, such as agriculture and industry, may need to be studied
• Relationships between sectors, like the household sector, the business sector and government in a democratic set-up, explain some things better than looking only at the whole economy
• A representative good may overlook distinctive features of individual goods:
  • production conditions of agricultural and industrial goods are of a different nature
  • one category of labour cannot distinguish the labour of a firm’s manager from that of its accountant
• So a handful of different kinds of goods are often taken instead, with different production technology and prices

Macroeconomics also analyses how the output levels, prices and employment levels of these different goods are determined.

2 Microeconomics vs Macroeconomics

• Consumers: choose their optimum combinations of goods, given their tastes and incomes
• Producers: try to make maximum profit, keeping costs as low as possible and selling at the highest price they can get
• Even a large company is “micro”: it acts in the interest of its own shareholders, which is not necessarily the interest of the country as a whole
• For microeconomics, “macro” (meaning large) phenomena like inflation or unemployment were either not mentioned or taken as given, because no individual buyer or seller could change them

3 Why was Macroeconomics Needed?

3.1 Adam Smith’s idea

• Smith suggested that if buyers and sellers in each market follow only their own self-interest, economists need not think separately about the wealth and welfare of the country as a whole
• But economists gradually discovered that they had to look further.

3.2 Three reasons to look beyond the markets

• So macroeconomists had to study the effects in the markets of:
  • taxation and other budgetary policies
  • policies for changing money supply, the rate of interest, wages, employment and output
• That is why macroeconomics has deep roots in microeconomics: it studies the aggregate effects of the forces of demand and supply
• It also deals with policies that modify these forces, if necessary, to follow choices made by society outside the markets
• In a developing country like India such choices are made to remove or reduce unemployment, give access to education and primary health care for all, provide good administration and sufficient defence

3.3 Two characteristics of macroeconomics

4 Emergence of Macroeconomics

• Macroeconomics emerged as a separate branch after the British economist John Maynard Keynes published The General Theory of Employment, Interest and Money in 1936

4.1 The Great Depression of 1929

• In the Great Depression of 1929 and the years after it, output and employment in the countries of Europe and North America fell by huge amounts
• Other countries of the world were affected as well
• Demand for goods was low, many factories lay idle, workers were thrown out of jobs
• In the USA, from 1929 to 1933:
  • the unemployment rate rose from 3 per cent to 25 per cent
  • aggregate output fell by about 33 per cent

4.2 Keynes and a new way of thinking

• These events made economists think about the functioning of the economy in a new way
• The fact that an economy may have long-lasting unemployment had to be theorised about and explained
• Keynes’ book was an attempt in this direction
• Unlike his predecessors, Keynes examined the working of the economy in its entirety and the interdependence of the different sectors
• The subject of macroeconomics was born

5 Context of this Book: the Capitalist Economy

• This book studies the working of the economy of a capitalist country
• In a capitalist country, production is mainly carried out by capitalist enterprises, each with one or several entrepreneurs

5.1 Factors of production and how revenue is shared

• Entrepreneurs may supply the capital themselves or borrow it
• They need natural resources: a part consumed in production (e.g. raw materials) and a part fixed (e.g. plots of land)
• The most important element is human labour, referred to as labour
• With these three factors, capital, land and labour, the entrepreneur produces output and sells it in the market; the entrepreneur’s own contribution is entrepreneurship. That is why the book’s Key Concepts list four factors of production

5.2 Features of a capitalist economy

5.3 Where and since when

• Applying these criteria, capitalist countries have come into being only during the last three to four hundred years
• Even now, strictly speaking, only a handful of countries in North America, Europe and Asia qualify as capitalist

The analysis of this book will not be applicable to such societies. Still, many developing countries have a significant presence of production units organised on capitalist principles.

• The entrepreneur hires wage labour from the market and employs the services of capital and land
• The resources used in production, such as labour, land and capital, are called inputs; with these inputs the entrepreneur produces goods and services (output)
• Motive: sell the output in the market and earn profits
• The entrepreneur faces risks and uncertainties, for example not getting a high enough price, which lowers profits
• In a capitalist country, factors of production earn their incomes through production and sale of output in the market

6 The Four Sectors of an Economy

Macroeconomics sees an economy as a combination of four sectors: households, firms, government and the external sector.

6.1 The household sector

Households also save and pay taxes. Where does their money come from?

The market in which firms sell their products could not function without the demand coming from households.

6.2 The external sector: the fourth sector

Firms, government and households are the major players in the domestic economy. But all countries also engage in external trade.

7 Key formulas

8 Differences the exam asks

Microeconomics vs macroeconomics is the table in section 2; capitalist firm vs peasant family / tribal society is the comparison in section 5.3; classical tradition vs Keynes is in section 4.2.