The Malthusian theory, proposed by Thomas Robert Malthus, primarily focuses on the relationship between the growth of population and the growth of food supply.

According to this theory, the population grows in a geometric progression, while the food supply grows in an arithmetic progression. 

When the population growth exceeds the food supply, it leads to checks on population growth, which Malthus categorized as “preventive” (like late marriages and self-control) and “positive” (like famines, wars, and diseases).

However, the theory does not directly address the development and growth of manpower