Which of the following classifications of countries are based on their economic productivity levels? (Select all that apply)

Countries can be classified based on their economic productivity levels into three main categories: developed, developing, and underdeveloped. Developed countries have high levels of income, advanced technology, and strong infrastructure, while developing countries are in the process of improving their economic conditions and may have moderate income levels. Underdeveloped countries struggle with low productivity, limited access to resources, and high poverty rates. For example, the United States is considered a developed country due to its high GDP and advanced industries, while a country like Haiti is often classified as underdeveloped because of its economic challenges. Understanding these classifications helps us see how countries are working towards improving their economies and living standards.