Slums
Slums, also known as slums, generally refer to the place where the poor live, and the United Nations Human Settlements Program defines it as a "high-density population" with a low standard and poverty as a basic feature. This term traditionally refers to the area where it was once fame, but declined with the relocation of the aborigines to the city to update the better areas; now the term also includes a large number of temporary accommodation in the developing cities. The slum effect is a kind of social phenomenon expressed by the peer effect, and it is also a kind of complex system power law. It usually occurs in the old or relatively adjacent low-cost community, and the inhabitants are relieved by the economic force. Of the results, due to strong economic strength continued to move out, the economic weakness continued to move into, and according to their economic capacity to shape the quality of housing, resulting in increased succession. Slums can be said to be a common phenomenon in urbanization, both in developing countries or developing countries are facing such problems, especially in developing countries. Slums often have crimes, drugs, illegal construction, garbage, drinking water and other issues. In recent years, the number of slums has increased significantly as a result of the population expansion in the third world, according to a report published by UN-HABITAT in 2006, where the slums of Commonwealth countries have 3.