Explain how the Structure of the Economy changes as a Nation gets more Developed

-A less Developed Nation will have a Large Primary Sector - Extracting Natural Resources and making Raw Materials -Development thus allows for the Secondary Sector to Expand, Increasing the use of Natural Resources and Negative Externalities. This also leads to the Mechanising of the Primary Sector -Eventually, it leads to the Growth of the Tertiary Sector as it needs Fewer Natural Resources and has less Pollution. But it also means for Imports to grow, so the Negative Externalities has just gone to another Nation