Swiss economist and historian (1773-1842).
Jean Charles Léonard de Sismondi, also known as Jean Charles Leonard Simonde de Sismondi (French: [ʒɑ̃ ʃaʁl leɔnaʁ də sismɔ̃di]; 9 May 1773 – 25 June 1842), whose real surname was Simonde, was a Swiss historian and political economist, who is best known for his works on French and Italian history, and his economic ideas. His Nouveaux principes d'économie politique, ou de la richesse dans ses rapports avec la population (1819) represents the first liberal critique of laissez-faire economics. He was one of the pioneering advocates of unemployment insurance, sickness benefits, a progressive tax,