The Theory of the Leisure Class is an economic and sociological study of how the wealthy spend and why others imitate them. Veblen begins by tracing the leisure class to the predatory or barbarian stage of culture, where a distinction arose between honourable exploit (war, hunting, governance) and base, useful labour. Out of that division grew both ownership and a class exempt from productive work.
His central mechanism is pecuniary emulation. Once a community produces a surplus, the contest for goods becomes a contest for relative standing rather than for survival. People judge themselves against their neighbours, are dissatisfied while they rank below, and quickly grow accustomed to each new level, so the striving never ends. Wealth itself becomes the conventional basis of esteem and self-respect.
Since esteem is granted only on evidence, wealth must be made visible. Veblen describes two complementary methods. Conspicuous leisure is the visible abstention from useful work, often performed on the owner's behalf by servants and dependents in what he calls vicarious leisure. Conspicuous consumption is the lavish, observable use of goods, likewise extended to wives and servants as vicarious consumption that reflects credit on the head of the household.
The common element in both, Veblen argues, is waste: expenditure of time or goods that demonstrates the ability to afford it rather than serving any practical end. He insists the word is technical, not a moral insult. From this principle he derives the pecuniary canons of taste, showing how the law of conspicuous waste shapes judgments of beauty and propriety, with dress as his clearest example, where people will endure discomfort to appear expensively and fashionably clad.
In the later chapters Veblen extends the analysis to belief and institutions. The leisure class, insulated from the pressures of industry, tends toward conservatism and the conservation of archaic habits of thought. He examines survivals of prowess in sport and gambling, the belief in luck, devout observances, and even higher learning, treating each as marked by leisure-class standards. The cumulative argument is that pecuniary status, far from being a private matter, pervades culture, taste, and conduct.