Why does the executive branch have agents

In the United States, as well as in any other democratic state, the executive branch of power takes care of all the areas of countries functioning. It needs agencies because the areas, such as Treasury, Agriculture, and Education, are very different and can be managed successfully only with focused attention of dedicated government officials led by a Secretary of the specific agency. Currently, there 15 different federal executive departments (agencies).

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.