Chapter 1 — Introduction

It introduces macroeconomics, explains how it differs from microeconomics, describes the Great Depression that inspired Keynes' 1936 General Theory, and outlines the capitalist economy context and the four sectors — households, firms, government, and the external sector — used in macroeconomic analysis.

Microeconomics studies individual economic agents — consumers and producers — and specific markets of demand and supply. Macroeconomics studies the economy as a whole, focusing on aggregate variables like total output, price level, and employment, and deals with economy-wide phenomena such as inflation and unemployment.

Macroeconomics emerged after the Great Depression of 1929 showed that economies could suffer prolonged unemployment and falling output. John Maynard Keynes published The General Theory of Employment, Interest and Money in 1936, examining the economy in its entirety and the interdependence of its sectors, founding macroeconomics as a discipline.

The Great Depression was a severe economic crisis beginning in 1929. In the USA, unemployment rose from 3% to 25% between 1929 and 1933, and aggregate output fell by about 33%. Demand for goods was low, factories lay idle, and workers lost jobs across Europe, North America, and other countries.

The classical tradition was the dominant school of thought before Keynes. It held that all labourers who are ready to work will find employment and all factories will work at their full capacity. The Great Depression contradicted this view, prompting Keynes to develop a new macroeconomic framework.

Because output, prices, and employment of different goods tend to move together, macroeconomists focus on a single imaginary representative commodity that stands for all goods and services in the economy. Its production, price, and employment level reflects the averages for the economy as a whole.

Macroeconomics sees an economy as composed of four sectors: (1) households, which consume, save, and pay taxes; (2) firms, which produce goods and services; (3) government, which taxes, spends, and provides public services; and (4) the external sector, involving exports, imports, and capital flows with the rest of the world.

A capitalist economy has three defining characteristics: (a) private ownership of means of production, (b) production takes place for selling output in the market, and (c) there is sale and purchase of labour services at a price called the wage rate (wage labour).

Macroeconomic policies are pursued by the State and statutory bodies such as the Reserve Bank of India (RBI) and the Securities and Exchange Board of India (SEBI). These institutions pursue public goals defined by law or the Constitution, not individual private profit or welfare.

John Maynard Keynes was a British economist born in 1883, educated at King's College, Cambridge. His book The General Theory of Employment, Interest and Money (1936) is regarded as one of the most influential economics books of the twentieth century and is credited with founding macroeconomics as a separate branch of economics.

Investment expenditure refers to expenses that raise productive capacity — for example, when producers use profits to buy new machinery or build new factories so that production can be expanded in the next period.

Households consume goods, save, and pay taxes. They earn income by working in firms (wages), government departments (salaries), or as owners of firms (profits), and can also earn rent by leasing land or interest by lending capital. Their demand is essential for the markets in which firms sell products.

Exports are goods the domestic country sells to the rest of the world. Imports are goods the economy buys from the rest of the world. The external sector also involves capital flows — foreign capital flowing into the domestic country or domestic capital flowing abroad.

Adam Smith is described as the founding father of modern economics (then called political economy). His book An Enquiry into the Nature and Cause of the Wealth of Nations (1776) was the first major comprehensive book on the subject. He argued that self-interested buyers and sellers would take care of the economy as a whole — a view that macroeconomics later had to go beyond.

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