The labor theory of value (LTV) posits that the economic value of a good or service is determined by the socially necessary labor time required to produce it under prevailing conditions. The theory is usually associated with Marxism, although versions of it were originally used by classical economists like Adam Smith and David Ricardo to explain the long-run "natural price" of commodities. For Karl Marx, the LTV was not primarily a theory of relative prices but a tool to explain the social dynamics of capitalism. Smith argued that a commodity's value was determined by the amount of labor it could command in exchange, while also suggesting that in primitive societies it was regulated by the labor embodied in its production. Ricardo developed a more consistent theory based solely on the quantity of labor embodied in a commodity. Marx built upon and radically transformed the classical theory, making it the cornerstone of his critique of political economy. He argued that value is a social relation specific to commodity-producing societies, with its substance being abstract labor—undifferentiated human labor whose magnitude is determined by the average labor-time required for production under normal conditions. The development of the LTV from the late 17th century reflected the rise of capitalism and the increasing focus on the sphere of production rather than exchange. Classical economists used the theory to analyze the distribution of the social product between different classes in the form of wages, profit, and rent. Marx extended this analysis to develop his theory of surplus value, which holds that profit originates from the exploitation of workers, whose unpaid labor is appropriated by capitalists. The theory also underpins his concept of commodity fetishism, whereby the social relations of production are obscured and appear as objective, natural relations between things. From the late 19th century, the LTV was largely supplanted in mainstream neoclassical economics by the theory of marginal utility. It has faced persistent critiques, notably from the Austrian School and neo-Ricardian economics, which focus on the "transformation problem" of reconciling values with prices. The LTV continues to be a foundation of Marxian economics, with modern debates often centering on whether it should be understood as a direct theory of price determination or as a framework for understanding the contradictory social form of labor under capitalism. Different schools of thought, such as value-form theory and the Temporal Single-System Interpretation, offer varying interpretations of its purpose and validity.
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