Observation that "work expands to fill the time available for its completion," and that a sufficiently large bureaucracy will generate enough internal work to keep itself 'busy' and so justify its continued existence without commensurate output. Proposed in 1955 in jest by the UK political analyst and historian Cyril Northcote Parkinson (1909-93) while criticizing the British Admiralty (which was growing bigger while the number of sailors and ships under its care was going down). It is quoted more as a keen insight into the functioning of large organizations than as an empirical reality. See also Peter principle.
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