Anarchy is an inherently transitionary stage between stable forms of government.

Anarchy is what happens during revolutions between the fall of an old regime and when the new regime is established enough to begin to perform the functions of government. (a billion and one exceptions apply because politics is not an exact science)

What people like to call anarchism is actually a form of minimalist government that performs the basic functions needed for a society to function. And before you ask a council of elders or town hall meetings are forms of government.