The document discusses concepts of economic development and underdevelopment. It defines economic development as achieving sustainable growth in income per capita to expand output faster than population growth. However, this definition fails to consider issues like poverty, inequality, and unemployment. Development is also defined sociologically as industrialization, economic growth, and improved living standards. Countries that have not achieved these objectives are considered underdeveloped. Economic development encompasses both quantitative and qualitative progress, including improvements in quality of life, health, education, and other social indicators measured by indexes like the Human Development Index.