Along with economic developments, discuss the change in the importance of different sectors of the economy.

The primary sector is the sector that is related to the extraction and production of natural resources. Such as agriculture, forestry, animal husbandry etc.
Secondary sector is related to the processing of these natural resources such as manufacturing.
The tertiary sector is related to the activities that support the other 2 sectors, such as transport, communication, banking, etc
In the initial stages of development, the primary sector is of utmost importance. It was the job sector for a large part of the working population of India. Slowly, and gradually as the country developed there was a shift of importance from the primary sector to the other sectors. The government took active participation for the improvement of this sector. It introduced the following :
1. Consolidation of holdings
2. Abolition of zamindari system
3, Land ceiling
4. Introduction of HYV seeds, pesticides, insecticides
5. Better quality of fertilizers and irrigation methods.
With all of this, the system improved and more food could be produced. People were now able to take up other activities such as transport, trader, craftsperson etc. Factories came into existence and now people could shift from working in farms to these factories. The consumers for these factory-made goods increased. This led to an increase in the importance of the tertiary sector. With further development, the tertiary sector became important. The main reasons behind the growth of this sector are :
1. With the increase in population, the number of hospitals, schools, banks, tourism facility demands has also increased.
2. With the increase in the number of working women, the demand for certain facilities like cook, housekeeper, daycare has increased.
3. The development of agriculture and industries have increased the demand for transportation, warehouse, retail etc
The percentage share of each sector over the years has been given below:

In the past 100 years, there has been a vast change in the shift of importance of sectors from the primary sector the tertiary sector.