The Labor Theory of Value

Where Does Value Come From?

The labor theory of value did not originate with Marx. Adam Smith and David Ricardo both argued that the value of a commodity was related to the labor required to produce it. Marx took this classical insight and transformed it into a critique of capitalism itself.

Marx distinguished between use-value (a commodity's usefulness — a coat keeps you warm) and exchange-value (what it trades for on the market). What makes qualitatively different commodities — coats, corn, chairs — commensurable on the market? Marx argued that what they share is that they are all products of human labor. The value of a commodity is determined not by the actual hours any individual worker puts in, but by the 'socially necessary labor time' required to produce it — the average time needed under prevailing conditions of production with average skill and intensity.

This is a crucial distinction. A lazy or unskilled worker does not create more value by working slowly. Value is set by the social average, which in turn is shaped by technology, organization, and the general level of productivity. Competition enforces this standard: producers who take longer than the social average go bankrupt.

Surplus Value: The Secret of Exploitation

Marx's original contribution was the theory of surplus value. Here is the core argument: Labor-power — the worker's capacity to work — is itself a commodity bought and sold on the market. Like any commodity, its value is determined by the labor time necessary to produce it — meaning the cost of food, housing, clothing, and training needed to keep the worker alive and working.

But labor-power has a unique property: when consumed (that is, when the worker actually works), it creates more value than it costs. If a worker's daily subsistence costs are equivalent to six hours of labor, but the worker works ten hours, the extra four hours produce surplus value — value that belongs to the capitalist, not the worker. This is not theft in the legal sense; the worker was paid the full market price for their labor-power. Exploitation, for Marx, is built into the structure of the wage relation itself, not into individual capitalists' greed.

The rate of surplus value — the ratio of surplus labor to necessary labor — is what Marx called the 'rate of exploitation.' Everything about the class struggle in the workplace can be understood through this lens: the fight over working hours, wages, intensity of work, and the introduction of machinery are all battles over how surplus value is divided.

Why the Labor Theory of Value Matters Politically

The labor theory of value is not merely an abstract economic argument — it is a political claim about power. If value is created by labor, then profit is not the reward for the capitalist's contribution but the appropriation of value created by workers. The entire edifice of capitalist accumulation rests on the extraction of unpaid labor time.

This reframing changes how we see the economy. When a company reports record profits, the labor theory of value asks: whose labor produced that surplus? When productivity rises but wages stagnate, it identifies a rising rate of exploitation. When automation replaces workers, it raises the question of who should benefit from the increased productive capacity that generations of workers helped build. Whether or not one accepts the theory's technical framework, its insistence that production is a social process — not merely a transaction between free individuals — continues to shape debates about economic justice.