Three Distinct Concepts

Economic stratification is often discussed as though class, income, and wealth were near-synonyms. In sociological analysis they are not. They refer to three analytically distinct dimensions of economic position, with different measurement strategies, different distributions, and different consequences. Conflating them is common in popular discourse and political journalism, but the conflation is costly: it obscures real patterns, produces confused policy debates, and makes it impossible to ask the questions the discipline has been developed to answer.

Class refers to a relational or structural position within an economic order. In the Marxian tradition, class is defined by one's relation to the means of production: those who own productive property (capital) versus those who do not and must sell their labor in exchange for wages (Marx 1867, vol. I, chs. 6-7). The relation is not a matter of income level at a given moment but of structural location within a system of production. A well-paid engineer and a struggling freelance designer both sell their labor; they are in the same class position in Marxian terms, however different their incomes.

Weber reworked and complicated this picture. In Economy and Society, Weber distinguished three dimensions of stratification: class (economic position determined by life chances in labor and commodity markets), status (social honor, lifestyle, and cultural recognition), and party (political power and organized influence). Weber's framework allows for the fact that a wealthy nouveau-riche family may lack status, while a professor of modest income may command considerable status and networked political influence (Weber 1922/1978, pp. 926-940). Weber's multidimensional account shapes most contemporary sociological approaches.

Income refers to the annual flow of resources a person or household receives — wages, salaries, business income, rents, dividends, interest, transfers. It is a flow measure: so many dollars per year. Income statistics come from tax records, household surveys such as the US Current Population Survey or the UK Family Resources Survey, and administrative data from social-insurance systems. The World Inequality Lab assembles harmonized long-run series by integrating these sources (Chancel, Piketty, Saez, and Zucman 2022).

Wealth is distinct again. It refers to the stock of assets a person or household holds — real estate, financial assets, pension rights in some definitions, business equity — net of debts. Wealth is a stock measure, accumulated over time, frequently inherited, and distributed far more unequally than income in almost every economy measured (Saez and Zucman 2016, pp. 531-537).

Why does the distinction matter analytically? A young professional in a high-cost city may have a high income and near-zero wealth (large student debt, no house). A retired farmer may have low current income and substantial wealth (owned land, no mortgage). The two occupy very different economic positions, yet a single aggregate measure would obscure the difference. Class position, in turn, is not reducible to either income or wealth: the self-employed small business owner and the salaried professional may have similar incomes but very different exposure to the business cycle, different relations to clients and employees, and different trajectories of mobility.

The measurement strategies diverge accordingly. Sociologists deploy occupational class schemes (like the Erikson-Goldthorpe-Portocarero or EGP scheme, the International Socio-Economic Index or ISEI, and Erik Olin Wright's exploitation-based scheme) to capture class position (Goldthorpe 2016, pp. 89-92; Wright 1997). Economists more often rely on income quantiles and Gini coefficients. Wealth researchers work with administrative estate and tax data and household surveys such as the US Survey of Consumer Finances. Each measurement strategy answers a different kind of question. This topic walks through the three concepts, their distributions, their consequences, and the contemporary debates about how much they still matter.