In underconsumption theory in economics, recessions and stagnation arise due to inadequate consumer demand relative to the amount produced. The theory formed the basis for the development of Keynesian economics and the theory of aggregate demand after the 1930s.

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Underconsumption. An Exposition and a Reply
Underconsumption theories : a history and critical analysis
Underconsumption, Over-Investment and the Origins of the Great Depression
Jealousy and underconsumption in a one-sector model with wealth preference
Underconsumption theories and Keynesian economics. Interpretations of the Great Depression
Not eating enough: overcoming underconsumption of military operational rations.
Two Views of Capitalist Stagnation: Underconsumption and Challenges to Capitalist Control
Inequality, Surplus Capital & Underconsumption: A Contemporary Analysis of J.A. Hobson’s Economic Theory of New Imperialism
"Underconsumption"of Alcohol as a Form of Deviance – Minimum Drinking Norms in New Zealand Society and the Implications of their P...
The simple analytics and empirics of the cyclical profit squeeze and cyclical underconsumption theories: Clearing the air