Who is the economic thinker that supported capitalism?

I'm not sure what you mean by "economic thinker," but I know that Milton Friedman was a proponent of it.
For a better answer, I would need your options if it a multiple choice.

I hope this helps ^^

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada