France is mainly divided into 18 administrative regions: 13 regions in metropolitan France (including the territorial collectivity of Corsica), and five located overseas. The regions are further subdivided into 101 departments, which are numbered mainly alphabetically. This number is used in postal codes and was formerly used on vehicle number plates. Among the 101 departments of France, five (French Guiana, Guadeloupe, Martinique, Mayotte, and Réunion) are in overseas regions (ROMs) that are also simultaneously overseas departments (DOMs), enjoy exactly the same status as metropolitan departments and are an integral part of the European Union. The 101 departments are subdivided into 335
Subdivided flat for public estates, they turn to live in subdivided flats, where rental prices are much cheaper than that of private housing options available. The second factor leading to the phenomenon comes from the widening wealth gap between the rich and poor. The Gini Coefficient of Hong Kong increased to 0.537, which manifests the serious economic inequality problem. In the subdivided units study report 2009 produced by the Society of Communication Organization, the median monthly personal income of the residents in subdivided units was $3200, which was below the median monthly personal income of the whole population in Hong Kong at