Karl Marx · Economics
Marx’s theory that the profit of capitalism is squeezed from the unpaid labour of workers - the hidden mechanism he called surplus value and exploitation.
In Capital, Marx sets himself a puzzle. If, in a fair market, everything tends to exchange at its true value - goods sell for what they are worth, workers are paid a going wage - then where does profit come from? How does the capitalist reliably end up with more money than they started with, if no one is simply cheating? Marx’s answer locates the secret in one very special commodity that the worker sells: their labour-power, their capacity to work.
This is why Marx calls the wage relationship exploitation - not as mere insult, but as a technical description. The source of profit, on his theory, is the unpaid portion of the working day: labour the worker performs but is not paid for. The capitalist’s drive to increase profit therefore becomes a drive to increase this surplus - by lengthening the working day, speeding up the pace, cutting wages, or replacing workers with machines. The relationship between capital and labour is, at its core, a struggle over how much of the worker’s labour goes unpaid.
Marx makes the mechanism of exploitation vivid by dividing the working day into two parts. In the first part - call it necessary labour - the worker produces value equal to their own wage, the value needed to keep them alive and able to work; if a worker’s daily subsistence is worth, say, the product of four hours, then in those four hours they have ‘earned’ their wage. But the worker does not stop at four hours; they work the full day the capitalist has bought - eight, ten, twelve hours. The hours beyond necessary labour are surplus labour, and the value created in them is surplus value, pocketed by the capitalist. The worker thus works part of the day for themselves and part of the day, in effect, for free - and the ratio of surplus labour to necessary labour is what Marx calls the rate of exploitation, the precise measure of how much of the worker’s day is unpaid.
This framework lets Marx analyse, with cold clarity, how capitalists can increase the surplus they extract - and it turns the workplace into a battleground. There are two basic strategies. The first is to extend the working day itself - make the worker labour twelve hours instead of ten - adding more surplus hours; Marx calls this absolute surplus value. This is why, he argues, the length of the working day became one of the great battlegrounds of capitalism: the capitalist presses to lengthen it (more surplus), the worker resists to shorten it, and the whole bloody history of the struggle for the ten-hour and then the eight-hour day is, in Marx’s reading, a struggle over the rate of exploitation. The second strategy is subtler: reduce the necessary-labour portion - make the hours needed to cover the worker’s wage fewer - by raising productivity through machinery, the division of labour, and speed-up, so that the worker covers their subsistence in less time and a larger share of the day becomes surplus; Marx calls this relative surplus value, and he sees it as the characteristic drive of mature industrial capitalism, the engine behind its relentless technological dynamism. This is a genuinely illuminating analysis whatever one thinks of the underlying value theory: it explains why capitalism is so restlessly driven to lengthen hours, intensify work, and mechanise production - all are ways of increasing the surplus extracted from labour - and why the conflict between employers and workers over hours, pace, and wages is not incidental but structural, built into the very relationship that produces profit.
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You learned that Marx locates profit in surplus value. Reconstruct how the worker’s labour creates more value than their wage, and why Marx calls this exploitation, in your own words.
Leads to John Maynard Keynes.
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