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A failed state is a political body that has disintegrated to a point where basic conditions and responsibilities of a sovereign government no longer function properly (see also fragile state and state collapse). A state can also fail if the government loses its legitimacy even if it is performing its functions properly. For a stable state it is necessary for the government to enjoy both effectiveness and legitimacy. Likewise, when a nation weakens and its standard of living declines, it introduces the possibility of total governmental collapse. The Fund for Peace characterizes a failed state as having the following characteristics:

Loss of control of its territory, or of the monopoly on the legitimate use of physical force therein
Erosion of legitimate authority to make collective decisions
Inability to provide public services
Inability to interact with other states as a full member of the international communityCommon characteristics of a failing state include a central government so weak or ineffective that it has an inability to raise taxes or other support, and has little practical control over much of its territory and hence there is a non-provision of public services. When this happens, widespread corruption and criminality, the intervention of state and non-state actors, the appearance of refugees and the involuntary movement of populations, sharp economic decline, and foreign military intervention can occur.Metrics have been developed to describe the level of governance of states. The precise level of government control required to avoid being considered a failed state varies considerably amongst authorities. Furthermore, the declaration that a state has "failed" is generally controversial and, when made authoritatively, may carry significant geopolitical consequences.

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