Capitalism is not a law of nature. It is a set of rules about who owns capital and how resources get allocated, rules that were built by people, in history, on purpose.
Most people treat capitalism as the default state of human economic life, the thing that happens when no one interferes. That framing hides its history. Capitalism is a specific institutional arrangement: private individuals or firms own capital and the means of production (land, factories, tools, financial assets), and markets, not central planners or guild custom, decide what gets made, how it gets priced, and who gets it. It emerged gradually out of late medieval and early modern Europe, as feudal obligations loosened, merchant classes gained power, and mercantilist states began directing trade for national advantage between roughly the sixteenth and eighteenth centuries. Adam Smith gave the system its classical liberal account in The Wealth of Nations (1776), arguing that individuals pursuing self-interest within a competitive market coordinate social welfare as if guided by an “invisible hand,” with minimal state interference.
The term itself, and the theory of what capitalism actually does, has never had one settled owner. Karl Marx and Friedrich Engels popularized “capitalism” as a critique in the mid-1800s, arguing the system’s profit motive depends structurally on extracting surplus value from workers’ labor, a built-in exploitation rather than a side effect. A century later, world-systems theorists such as Immanuel Wallerstein reframed capitalism again, not as a set of national economies that happen to trade with each other, but as a single integrated global system dating to the “long” sixteenth century, organized around a core-periphery division of labor. Max Weber added a different angle still, tracing part of capitalism’s early psychological engine to a religious ethic rather than to economic logic alone (see Protestant Work Ethic). None of these accounts fully displaces the others; capitalism remains contested terrain precisely because it is a human choice about ownership and allocation, not a discovered law of nature.