How capitalism works, how it exploits, and why it must be overthrown
Political economy is the study of the social relations of production — how human beings organise their economic life, who owns what, and how the products of labour are distributed. Marxist political economy exposes the mechanisms by which the capitalist class extracts wealth from the working class.
Unlike bourgeois economics, which presents capitalism as natural and eternal, Marxist political economy reveals capitalism as a historically specific mode of production with a beginning and an end.
The value of a commodity is determined by the socially necessary labour time required to produce it. All value comes from human labour. Machines, raw materials, and land transfer value but do not create it. Only living labour creates new value.
The worker produces more value in a working day than the value of their wages. This difference — surplus value — is appropriated by the capitalist. This is the source of all profit, rent, and interest. It is legalised theft.
As capitalists invest more in machinery (constant capital) relative to labour (variable capital), the rate of profit tends to fall. This drives capitalism toward ever more severe crises, intensified exploitation, and imperialist expansion.
Capitalism did not arise through hard work and thrift. It arose through violence: the enclosure of common lands, colonial plunder, the slave trade, and the forcible separation of producers from the means of production. The history of capital is written in blood.
Capitalism produces not because people need goods, but because capitalists need profit. Workers are paid less than the value they produce, so they cannot buy back all they create. The result: periodic crises of overproduction, mass unemployment, and destruction of goods while millions go without.
Competition leads to monopoly. Smaller capitalists are driven out or absorbed. Wealth concentrates in fewer hands. Today, a handful of monopolies dominate entire industries, entire countries, entire continents. This is not a distortion of capitalism — it is its logical result.
"Capital is dead labour, that, vampire-like, only lives by sucking living labour, and lives the more, the more labour it sucks."
— Karl Marx, Capital Volume I (1867)Imagine a worker in a factory. They work 8 hours a day. In the first 4 hours, they produce enough value to cover their wages — the cost of food, shelter, clothing, and everything they need to survive and return to work tomorrow. This is necessary labour time.
But the worker does not leave after 4 hours. They work another 4 hours. The value produced in these hours goes entirely to the capitalist. This is surplus labour time, and the value it produces is surplus value — the source of the capitalist's profit.
The capitalist did not earn this. They did not work for it. They extracted it by virtue of owning the means of production — the factory, the machines, the raw materials — which the worker needs access to in order to survive. This is the essence of capitalist exploitation: the private appropriation of socially produced wealth.
Marx calls the ratio of surplus value to variable capital (wages) the rate of exploitation or the rate of surplus value. If a worker creates £400 of value per day and receives £100 in wages, the rate of exploitation is 300%. The capitalist takes three times what the worker receives.
This is not exceptional — it is the norm. Under modern monopoly capitalism, the rate of exploitation has only intensified, driven by longer hours, faster work rates, automation, and the suppression of wages through anti-union legislation and the reserve army of labour (unemployment).
Absolute surplus value is extracted by lengthening the working day or intensifying the pace of work. Relative surplus value is extracted by reducing the value of labour power — by cheapening the goods workers need to survive (through industrialisation, imports from low-wage countries, etc.). Both methods serve the same purpose: maximising the portion of the working day that produces value for the capitalist.
Surplus value is not simply consumed by the capitalist — it is reinvested as capital, buying more machinery, more raw materials, and hiring more workers, to extract more surplus value. This is the circuit of capital: M — C — M' (money — commodity — more money).
But this process contains an inherent contradiction. As capitalists invest more in constant capital (machinery) relative to variable capital (labour), the organic composition of capital rises and the rate of profit tends to fall. To counteract this, capitalists must intensify exploitation, expand into new markets, and destroy rival capitals.
This is why capitalism is inherently crisis-prone. Economic crises are not accidents or policy failures — they are the inevitable result of the contradictions within the capitalist mode of production itself. Each crisis destroys capital, impoverishes workers, and prepares the conditions for the next, deeper crisis.
"Accumulation of wealth at one pole is, therefore, at the same time accumulation of misery, agony of toil, slavery, ignorance, brutalisation, and moral degradation at the opposite pole."
— Karl Marx, Capital Volume I (1867)When the domestic market can no longer absorb surplus capital, capitalism turns outward. Lenin showed that imperialism is not a policy choice but a structural necessity of monopoly capitalism. The great powers divide the world among themselves, extracting super-profits from the colonies and semi-colonies.
Today, this takes the form of neo-colonialism: debt traps, structural adjustment programmes, unequal trade agreements, military bases, and regime change operations. Britain and France remain major imperialist powers, extracting wealth from Africa, the Middle East, and beyond through their corporations, their banks, and their bombs.
The super-profits of imperialism allow the ruling class to bribe a thin layer of the working class at home — the labour aristocracy — creating a social base for reformism and class collaboration. This is why social democracy always betrays the working class: it is materially invested in the continuation of imperialism.
The only solution to the contradictions of capitalism is the revolutionary overthrow of the bourgeoisie and the establishment of the dictatorship of the proletariat. Under socialism:
The essential introduction to Marx's economic theory. Start here.
A clear, accessible lecture on surplus value and exploitation.
The masterwork. A complete scientific analysis of the capitalist mode of production.
Lenin's analysis of monopoly capitalism and imperialist war.
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