original_query: Who provided the first theory of crisis in a critique of classical political economy's assumption of equilibrium between supply and demand?
query: Who provided the first theory of crisis in a critique of classical political economy's assumption of equilibrium between supply and demand?
answer: Jean Charles Léonard de Sismondi (1773–1842) provided the first theory of crisis in a critique of classical political economy's assumption of equilibrium between supply and demand.