Why developed countries have no employement on primary sector?

Developed countries have minimal employment in the primary sector primarily due to advancements in technology and industrialization, which have increased agricultural and resource extraction efficiency. As economies evolve, labor shifts towards the secondary (manufacturing) and tertiary (services) sectors, where higher value-added activities and better-paying jobs are found. Additionally, urbanization and a growing demand for diverse services contribute to the decline of primary sector employment. Consequently, fewer workers are needed in agriculture and mining as these sectors become more mechanized and productive.