Charles Dunoyer Barthélemy-Charles-Pierre-Joseph Dunoyer de Segonzac (20 May 1786 – 4 December 1862), better known as Charles Dunoyer (French pronunciation: [ʃaʁl dynwaje]), was a French economist of the French Liberal School.
Dunoyer gave one of the earliest theories of economic cycle, building on the theory of periodic crises of Jean Charles Léonard de Sismondi and introducing the notion of the economy periodically cycling between two phases.[1]