Describe the change in the different sectors of the economy over a period of time.

The history of developed countries indicates about the shifts that have taken place
between the sectors as given below:
(i) In the initial stages, tire primary sector was the most important sector. Most of the people were employed in this sector i.e., agricultural sector.
(ii) With the changes in the method of farming, the production increased tremendously. People started trading and other activities. Increase in production of grain also led to the need for transportation and other facilities. Activities increased but still most of the produced goods were natural products from the primary sector and most people were employed in this is sector.
(iii) After the inventions of machines, factories were established to manufacture goods. The industrial sector employed more and more people and the secondary sector became most Important in total production and employment.
(iv) In the past 100 years, there has been a further shift from secondary to tertiary sector in developed countries. This sector is also called service sector because it provides basic service such as teachers, doctors, lawyers, internet cafe, ATM booths. Tertiary sector has become most important in terms of production. At present, it employs the maximum number of people. So
there has been a shift from primary sector to secondary sector and then to tertiary sector or service sector in the developed countries.