Final answer:
Economically underdeveloped countries have a higher proportion of young individuals, such as in South America. The World Bank uses economic factors to classify countries as developing or developed.
Explanation:
Economically underdeveloped countries tend to have the greatest proportion of young individuals due to higher birth rates and lower life expectancy.
For example, countries in South America like Bolivia and Peru have faced political turmoil and high poverty rates, contributing to a younger population.
Development models by organizations such as the World Bank classify countries based on economic factors like GNP per capita, distinguishing between developing and developed nations.
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