Question

why has been shift from one sector to another sector in the developed countries?​

Answer 1

with the growth of technology, secondary sector gradually became more important in terms of total production and employment. then, after a long span of time, and new services came up with the development of technology, the tertiary sector became most important in terms of total production and employment.

Answer 2

The service sector has become the most important in terms of total production. Most of the working people are also employed in the service sector. This is the general pattern observed in developed countries shift from secondary to tertiary sector.