1.1. Emergence of Macroeconomics

Macroeconomics, as a separate branch of economics, emerged after the British economist John Maynard Keynes published his celebrated book The General Theory of Employment, Interest and Money in 1936. The dominant thinking in economics before Keynes was that all the labourers who are ready to work will find employment and all the factories will be working at their full capacity. This school of thought is known as the classical tradition.

Macroeconomics is a branch of economics that focuses on the behavior and performance of an economy as a whole. It came about after John Maynard Keynes published an influential book in 1936. Before Keynes, economists believed in classical economics, which assumed that laborers willing to work could find jobs and factories would operate at maximum capacity. This assumption was challenged by real-world events, leading to the development of macroeconomic theories.

Think of a factory that produces cars. In classical economics, it was assumed that if there were workers willing to help assemble cars, the factory would always be at full capacity, producing cars that would be sold without delay. However, if a recession occurs and fewer people can afford cars, the factory may need to reduce operations or lay off workers, highlighting the limitations of classical assumptions.

However, the Great Depression of 1929 and the subsequent years saw the output and employment levels in the countries of Europe and North America fall by huge amounts. It affected other countries of the world as well. Demand for goods in the market was low, many factories were lying idle, workers were thrown out of jobs. In USA, from 1929 to 1933, unemployment rate rose from 3 per cent to 25 per cent (unemployment rate may be defined as the number of people who are not working and are looking for jobs divided by the total number of people who are working or looking for jobs). Over the same period aggregate output in USA fell by about 33 per cent. These events made economists think about the functioning of the economy in a new way.

The Great Depression, which began in 1929, dramatically changed the economic landscape in the US and globally. It led to massive unemployment, with the rate rising from 3% to 25% as many factories closed due to lack of demand. This disaster revealed that economies could experience prolonged unemployment and underproduction, pushing economists to rethink previous assumptions and develop new theories to understand economic cycles.

Imagine a town dependent on a single factory that produces ice cream. If suddenly, a health scare reduces the demand for ice cream, the factory lays off workers, which causes them to spend less in the local economy. Other businesses suffer too because their customers can no longer afford to buy non-essential items. This ripple effect highlights how interconnected economies are and the impact of decreased demand.

Keynes’ book was an attempt in this direction. Unlike his predecessors, his approach was to examine the working of the economy in its entirety and examine the interdependence of the different sectors. The subject of macroeconomics was born.

Keynes approached economics by looking at the economy as a whole rather than just individual parts. He believed that different sectors of the economy (like households, businesses, and government) were interconnected. This comprehensive perspective led to the development of macroeconomics as a distinct field, emphasizing the importance of aggregate demand and the role of government intervention in stabilizing the economy.

Think of a large orchestra with many different instruments. The conductor ensures that all parts work together harmoniously, creating a beautiful sound. Similarly, Keynes advocated that for an economy to function well, all sectors must coordinate effectively, and sometimes the government must step in to help with this 'conducting' during economic duress.

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