Came up with theories about populations and resources.

Thomas Robert Malthus

Thomas Robert Malthus FRS was a cleric and philosopher, important in the areas of administration and conservation.

An Essay was written by  Malthus on the Postulate of Population, which concluded that an expansion in a nation's petroleum production explained the well-being of the commonality, but the development was short-lived because it started to association growth, which in turn succeeded the primary per capita. In other words, people could allocate affluence for community development rather than for having a great model of continuation, a possibility that has influenced acknowledged as the "Malthusian trap" or the "Malthusian specter". 

they can increase to boost the enonomy.