What does the history of developed countries indicate about the shifts that have taken place between sectors?

Q.:- What does the history of developed countries indicate about the shifts that have taken place between sectors?

 

Answer:-

The history of developed countries indicates that there has been a major shift from the secondary sector, i.e., manufacturing and industries, to the tertiary sector, i.e., services. The service sector has become the most important sector of the economy and most of the employed people in the developed countries are employed in this sector.