The metaphor of the invisible hand explains how

The metaphor of the invisible hand is meant to describe the ability of a free market to be able to balance itself out. Given the ability of the economic market to adjust for error, the invisible hand would seemingly claim that any inequalities would be ultimately balanced as a result of the invisible force.

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