Labor theory of value

The labor theory of value (LTV) is an economic theory that argues that the economic value of a good or service is determined by the total amount of socially necessary labor required to produce it. The LTV is usually associated with Marxian economics, although it also appears in the theories of earlier classical economists such as Adam Smith and David Ricardo.

Smith saw the price of a commodity in terms of the labor that the purchaser must expend to buy it, which embodies the concept of labor commanded. Ricardo, building on Smith, developed a more consistent labor theory of value, arguing that the value of commodities is determined by the quantity of labor embodied in their production. Karl Marx's theory, which is the most elaborate and influential, holds that value is a social relation specific to commodity-producing societies. Marx distinguished between concrete useful labor, which creates use value, and abstract labor, the substance of exchange value. He argued that the magnitude of value 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 explain the "natural price" around which market prices fluctuate, and to analyze the distribution of the social product between different classes in the form of wages, profit, and rent. Marx extended this analysis to explain the origin of surplus value and exploitation under capitalism, arguing that profit originates from the unpaid surplus labor of workers.

From the late 19th century, the labor theory of value was largely supplanted in mainstream neoclassical economics by the theory of marginal utility. It has been the subject of extensive critique, including the charge that it is unable to account for the effects of capital intensity on prices (the transformation problem), that it is logically inconsistent when applied to complex production processes such as joint production, and that its reliance on value as a metric is redundant because prices can be derived directly from physical production data. Despite these critiques, the LTV remains a central concept in most schools of Marxian economics. Modern debates often center 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, with different schools of thought offering varying interpretations of its purpose and validity.