In five minutes: Das Kapital explained
Das Kapital (Capital) is Karl Marx's attempt to explain how a capitalist economy works, and why it produces great wealth and deep insecurity at the same time. Its subtitle is A Critique of Political Economy. Marx was not only describing factories; he was taking apart the ideas of Adam Smith and David Ricardo. The book is one of the pillars of the wider story told in Ideas That Shaped the 19th Century.
The core argument fits in three sentences. Under capitalism, most people own no land or machines, so they sell their ability to work for a wage. In a working day they produce more value than that wage is worth. The owner keeps the difference, which Marx calls surplus value, and it is the source of profit.
Only Volume 1 was published in Marx's lifetime, in 1867. Volumes 2 and 3 were put together by his friend Friedrich Engels and appeared in 1885 and 1894. Together they run to thousands of pages, which is why most readers start with Volume 1, and often with just a few chapters of it.
Why Marx wrote it
Karl Marx was born in Trier in 1818 and worked as a journalist and philosopher. With Engels he wrote the Communist Manifesto in 1848, the year revolutions swept Europe. When those revolutions failed, Marx settled in London in 1849. Britain was the most industrialised country in the world, so it was the best place to study the new economy up close.
For years Marx read in the British Museum Reading Room. His evidence was not abstract theory. He used government Blue Books, parliamentary inquiries and the reports of factory inspectors, who recorded hours, wages and accidents in mills and workshops. He drafted large manuscripts in 1857 and 1858 (later published as the Grundrisse) and issued a first instalment, A Contribution to the Critique of Political Economy, in 1859.
Marx was poor for most of this time, and Engels, who worked in his family's cotton business in Manchester, sent him money. Volume 1 of Das Kapital was published in Hamburg in 1867. Marx also wrote a second German edition in 1873, and a French edition followed in the mid-1870s.
What Volume 1 argues, step by step
The standard English edition has 33 chapters in eight parts. The argument builds in a clear order.
1. The commodity and its hidden social side (Part 1)
Marx starts with the simplest thing in a market economy: a commodity, something made to be sold. It has a use-value (what it is good for) and an exchange-value (what it trades for). He argues that what makes different goods comparable is the human labour needed to produce them, measured as socially necessary labour time, meaning the time needed under normal conditions of the day.
This part also contains his idea of commodity fetishism. In a market, relations between people look like relations between things: coats and linen seem to have prices on their own, and the work and social arrangements behind them disappear from view.
2. Money becomes capital (Part 2)
Ordinary trade is selling to buy: you sell wheat, then buy a coat. Capital works the other way round. Money is turned into goods in order to come back as more money (M–C–M′). The puzzle is where the extra money comes from, if every exchange swaps equal values. Marx’s answer is that one commodity is special: labour power, the worker's capacity to work.
3. Surplus value and the working day (Part 3)
A worker is paid the value of labour power, roughly what is needed to live and raise a family. But the worker can produce that value in only part of the day. The rest is surplus value. Marx stresses that nobody has been tricked in the exchange; the exploitation, in his sense, lies in the structure.
The long chapter on the working day shows how owners pushed hours up and how workers and the state pushed back through Factory Acts. Marx cites the case of Mary Anne Walkley, a young dressmaker who died in London in 1863 after extremely long hours.
4. Machines and factories (Parts 4 and 5)
Owners can raise surplus value by lengthening the day, or by making workers more productive so that the paid part of the day shrinks. Marx calls the second route relative surplus value. He traces how cooperation, the division of labour and then machinery did this, and argues that machines in capitalist hands often made work more intense and less skilled instead of freeing people from it.
5. Accumulation and the reserve army (Part 7)
Owners reinvest profit to compete, so capital grows. As machinery replaces labour, Marx says, a pool of unemployed people forms, a reserve army of labour that keeps wages down. Wealth piles up at one end of society while insecurity piles up at the other.
6. So-called primitive accumulation (Part 8)
Where did the first capital and the first wage workers come from? Classical economists told a story of hard-working savers. Marx replied with history: the enclosure of common land in England, the forced removal of farming families, and colonial conquest and the slave trade. In his account capital came into the world, in a phrase he borrows, dripping blood and dirt.
Volumes 2 and 3 and the unfinished plan
Volume 2 looks at the circulation of capital: how it moves through production, sale and reinvestment, how long this takes, and how the whole economy can reproduce itself. Volume 3 asks how surplus value is divided among industrial profit, interest and rent. It also sets out Marx's argument that the rate of profit tends to fall as machinery grows relative to labour.
Marx died in London on 14 March 1883, leaving drafts that were hard to read. Engels spent more than a decade editing them. Karl Kautsky later published Marx's notes on earlier economists as Theories of Surplus Value (1905–1910), sometimes called Volume 4. Marx had planned further books, for example on the state and world trade, that he never wrote.
How it was received, and criticised
Volume 1 sold slowly at first, but it spread. A Russian translation appeared in 1872, the first in any foreign language. An English translation by Samuel Moore and Edward Aveling, edited by Engels, came out in 1887. Socialist parties and trade unions across Europe, grouped in the Second International, treated it as their main theoretical text. Later it became part of the intellectual background to the Russian revolutionaries; see Marxism Explained and Marx's Economics: Surplus Value and Class Struggle for how those ideas developed.
Critics raised several objections. In the 1870s the marginal revolution in economics explained value through utility and scarcity, not labour. Eugen von Böhm-Bawerk argued in 1896 that Volume 3 contradicted Volume 1, a dispute known as the transformation problem: how labour values become market prices. And Marx's expectation that workers' conditions would worsen steadily did not match what happened in industrial countries, where real wages rose after the mid-19th century.
Defenders reply that the book is still useful for what it explains well: how markets organise work, why economies swing between boom and crisis, and how inequality can grow. Historians also value it as a close portrait of Victorian factory life. It is not the same as a plan for a socialist state; Marx wrote very little about how a future society would run.
What exams ask
- Dates: Volume 1 in 1867; Marx's death in 1883; Volume 2 in 1885; Volume 3 in 1894; first English translation in 1887.
- Key terms: commodity, use-value and exchange-value, labour power, surplus value, capital accumulation, reserve army of labour, primitive accumulation, commodity fetishism.
- Compare: Smith and Ricardo saw markets and labour as sources of national wealth. Marx used the same labour-based idea of value to argue that profit depends on unpaid surplus labour.
- Significance: it gave the labour movement and socialist parties a systematic theory, and it shaped the debates about industrial society, inequality and the role of the state that run through the 19th and 20th centuries.
- Common mistake: do not confuse the Communist Manifesto (1848, a short political pamphlet) with Das Kapital (1867, a long economic analysis). Also keep nationalism, a rival force of the era, separate; see What Is Nationalism?
Read next
- Marxism Explained: the wider set of ideas, from the Manifesto to later movements.
- Marx's Economics: Surplus Value and Class Struggle: a closer look at the economic concepts introduced here.
- What Is Nationalism?: the other great political force of the same century, often in conflict with class-based thinking.
