Why does spatial inequality exist in urban areas

Spatial inequality exists in urban areas because resources in urban areas like many other areas of the world are not divided evenly and different parts of a city receive better access to resources such as education, groceries stories with fresh produce, police forces, and access to jobs. In this way resources are unevenly divided in cities between high and low socio-economic areas. 

Answerdistinguish between the mercalli scale and the richter scale;