The political doctrine of anacyclosis is a cyclical theory of political evolution. The theory of anacyclosis is based upon the Greek typology of constitutional forms of rule by the one, the few, and the many. Anacyclosis states that three basic forms of “benign” government (monarchy, aristocracy, and democracy) are inherently weak and unstable, tending to degenerate rapidly into the three basic forms of “malignant” government (tyranny, oligarchy, and ochlocracy). Note that “ochlocracy” refers to mob rule, not the concept of democracy created in the late 18th century.
According to the doctrine, “benign” governments have the interests of all at heart, whereas “malignant” governments have the interests of a select few at heart. However, all six are considered unworkable because the first three rapidly transform into the latter three due to political corruption.
Definition from Wikipedia.