Class structure and mobility: measurement, intergenerational mobility, the American Dream myth

Intuition Beginner

Social class shapes nearly every part of a person's life — health, education, where you live, who you marry, even how long you live. But what exactly is class? Sociologists measure it in three main ways: income (what you earn), wealth (what you own minus what you owe), and occupation (your job and the prestige attached to it). These measures often disagree. A doctor with heavy student debt has high occupational prestige but modest wealth; a retiree with a paid-off house may have substantial wealth but low income.

The American Dream says anyone can succeed through hard work. The data tell a different story. A child born poor in the United States has only about a 7.5% chance of reaching the top fifth of income as an adult — one of the lowest mobility rates among rich countries. Thomas Piketty showed that wealth inequality keeps rising: the return on capital (investments, real estate) consistently outpaces economic growth, so wealth concentrates over time.

Where you grow up matters enormously. Raj Chetty's research found that children raised in Salt Lake City have far better odds of escaping poverty than those raised in Charlotte, even when family income is similar. Class is not just about individual effort. It is about the structures — schools, neighborhoods, inheritance, networks — that shape where effort can take you.

Visual Beginner

The table maps the three standard measures of class and the key mobility facts covered in this unit.

Measure of class	What it captures	Why it matters
Income	Money earned over a year	Tracks current living standard
Wealth	Assets minus debts (net worth)	Captures accumulated advantage and security
Occupation	Job and its social prestige	Shapes identity, networks, and health

Mobility fact	Figure	Source
Chance a poor child reaches the top fifth (US)	~7.5%	Chetty et al. 2014
Absolute mobility, 1940 cohort	~90%	Chetty et al. 2017
Absolute mobility, 1980 cohort	~50%	Chetty et al. 2017
US intergenerational income elasticity	~0.47	Solon 1992, Mazumder 2005

Wealth is more unequally distributed than income in nearly every rich country, and the gap between the two measures widens at the top. A family can earn a high salary and still own very little; a family with modest earnings can hold large assets accumulated across generations.

Worked example Beginner

Take two American families. Family A earns $120,000peryear.FamilyBearns$40,000. Family A earns three times as much. The intergenerational income elasticity for the United States is about 0.47, which means roughly 47% of a family's income advantage tends to show up in the next generation.

Apply that to the $80,000gap:0.47\times$80,000 = $37,600.Onaverage,Family{A}^{\prime }schildrenwillstarttheirearninglivesabout$37,600 ahead of Family B's children. That head start exists before either child has worked a single day.

Now compare with a Nordic country, where the elasticity is about 0.20. The same $80,000gappassesononly0.20\times$80,000 = $16,000. The starting line is far more level.

What this tells us. Nearly half of the income gap between American families is handed down. Effort and talent matter, but they run on a track whose starting position was set a generation earlier.

Check your understanding Beginner

Formal definition Intermediate+

Social class is a ranking of individuals and families along dimensions of economic resources and social position that is reproduced across generations through institutions rather than through individual merit alone. Two families may hold the same rank on one measure and different ranks on another, so sociologists define class along several axes and specify which axis is in use.

Objective measurement. Three indicators dominate. Income is the flow of money received over a period, primarily wages and transfers. Wealth (net worth) is the stock of assets minus liabilities at a point in time. Occupation is the job a person holds together with the prestige attached to it, often encoded in scales such as the UK's NS-SEC or the Duncan Socioeconomic Index (SEI).

Subjective measurement. Class can also be measured by asking people which class they belong to. Subjective class identification often tracks occupation and income loosely and is shaped by culture, aspiration, and ideology; it can diverge sharply from objective indicators, especially among manual workers who identify as middle class.

Stratification systems vary in how open they are. Closed systems — slavery, caste — assign rank at birth by ascription and permit little movement. Estate systems (feudal Europe: clergy, nobility, commoners) fix legal rights and duties by birth. Class systems are open in principle: rank is achieved through education, work, and accumulation, and movement between layers is possible. Openness in principle is not openness in fact; the data on mobility measure the gap between the two.

Weber splits stratification into three analytically distinct dimensions: class (life chances determined by position in markets), status (social honor and lifestyle), and party (power). The three correlate but do not coincide — a professor may have high status and modest wealth; a union leader may hold party power without owning capital.

Social mobility is movement across class positions. Intergenerational mobility compares individuals to their parents; intragenerational mobility tracks movement within one life. Absolute mobility is the share of a generation that ends up better off than their parents — in the US it fell from roughly 90% for the 1940 birth cohort to roughly 50% for the 1980 cohort (Chetty et al. 2017). Relative mobility is the association between parents' and children's ranks, independent of whether the whole distribution is rising.

The standard quantitative summary of relative mobility is the intergenerational income elasticity (IGE), estimated from

$$\ln y_{\text{child}}=\alpha +\beta \ln y_{\text{parent}}+\epsilon ,$$

where $y$ is permanent income and $\beta$ is the IGE. A value of zero means a child's income is unrelated to parents' (perfect mobility); a value of one means the parent gap is fully inherited. The US estimate sits near 0.47, the Nordic countries near 0.15–0.27.

Inequality metrics summarize the distribution of income or wealth. The Gini coefficient ranges from 0 (perfect equality) to 1 (one unit holds everything). The Palma ratio divides the top 10% share by the bottom 40% share and is more sensitive to the extremes. Top income shares (the share held by the top 1% or 0.1%) track concentration directly and are the basis of the World Inequality Database ^{[Piketty 2014]}.

Comparative framework Intermediate+

The major class frameworks disagree about what is being distributed and how positions are reproduced. Reading them comparatively exposes what each captures and what each misses.

Marx: class as relation to production

For Marx, class is defined by the relationship to the means of production: owners (bourgeoisie) who purchase labour versus workers (proletariat) who must sell it. The divide is structural and binary; income level and lifestyle are secondary to whether one employs others or is employed. This framing makes exploitation — the extraction of surplus from labour — central, but it struggles to locate managers, professionals, and small proprietors who occupy positions between the two poles.

Weber: class, status, and party

Weber keeps the economic core but refuses the binary. Class is a market situation — the set of life chances determined by the skills and assets one can sell. Status is social honor, sustained by styles of life, marriage patterns, and cultural consumption. Party is the capacity to exercise power in organizations. Because the three dimensions can move independently, Weber's framework accommodates cases Marx cannot: the cash-poor professor with high status, the rich entrepreneur denied social acceptance, the union official with power but no fortune.

Occupation-based scales

Practical sociology often drops theory for measurement. Registrar General's Social Class, the UK's NS-SEC, and the Duncan SEI rank occupations by typical education, income, and prestige. These scales are reproducible and prediction-rich — they correlate strongly with health, educational attainment, and mortality — but they treat class as a gradient of job attributes rather than as a relational structure, which is what Marx and Weber were after.

Bourdieu and Wright: capital and contradiction

Bourdieu generalizes Weber by treating class as a position in a multidimensional space of capitals: economic (money and assets), cultural (knowledge, credentials, taste), social (networks), and symbolic (recognition). These capitals are exchanged within fields, and the body internalizes them as habitus — dispositions that feel natural but are classed. Erik Olin Wright, working in the Marxist tradition, introduces contradictory class locations: managers are simultaneously workers (they sell labour) and controllers of capital (they command other workers and dispose of resources). The point of both moves is to recover structure that a simple occupation scale flattens.

Income versus wealth

Wealth inequality exceeds income inequality in every advanced economy for which we have data. In the United States, the top 1% of households holds roughly 30–40% of wealth while receiving about 20% of income; the bottom half holds near-zero net worth. Wealth transmits across generations through inheritance, inter vivos gifts, and the security that allows risk-taking, which is why the racial wealth gap is an order of magnitude larger than the racial income gap — median White household wealth is roughly ten times median Black household wealth (Oliver and Shapiro 1995). Income gaps can narrow within a generation; wealth gaps, built over centuries of exclusion from homeownership and credit, do not.

Mobility across nations

Comparative mobility research finds two robust patterns. First, absolute mobility tracks growth: when national income grows broadly, most children out-earn their parents; when growth stalls or concentrates at the top, absolute mobility falls — accounting for the US drop from 90% to 50%. Second, relative mobility varies systematically with policy. Featherman, Jones, and Hauser (1975) found that industrial societies share broadly similar patterns of occupational mobility, but later work showed that welfare-state generosity, education funding, and tax progressivism shift the IGE: Nordic countries cluster near 0.15–0.27, the United States and United Kingdom near 0.40–0.50. The same market economies produce markedly different levels of inherited advantage.

The American Dream as ideology

The empirical record — low elasticity, falling absolute mobility, geographic variation in Chetty's Opportunity Atlas — sits in tension with the national self-image of a society where anyone can rise through effort. The ideology is not false in the sense that upward movement is impossible; some individuals do rise. It functions by treating exceptional cases as typical and by locating the cause of failure in the individual rather than in the structure that sets the odds. Sociological analysis holds the structure constant and asks why the odds vary so much by birthplace, parentage, and race.

Exercises Intermediate

Advanced analysis Master

Mobility tables and log-linear models

Intergenerational mobility is classically studied through the mobility table — a square contingency table cross-classifying origin class against destination class. The raw association in such a table conflates two sources. Structural (or absolute) mobility reflects changes in the marginal distribution: when the professional class expands, children move up regardless of association, because there are simply more professional slots. Exchange (or relative) mobility reflects circulation within an otherwise stable structure — a working-class child entering the professions while a professional's child drops out.

Leo Goodman's log-linear models separate the two. The quasi-independence model allows origin and destination to associate only on the diagonal (immobility) and otherwise independent; quasi-symmetry tests whether upward and downward flows mirror each other; uniform association imposes a single odds ratio across the table. Goodman's RC association models (row-column) let the association between categories vary smoothly along an underlying scale, recovering the ordered structure of class without imposing it a priori. The odds ratios estimated by these models are invariant to the marginal distributions, which is why they are the preferred summary of relative mobility: a society can have high absolute mobility (shifting margins) and low relative mobility (rigid odds ratios) at the same time.

Chetty's Opportunity Atlas and the five factors

Raj Chetty and collaborators linked US tax records across generations to construct the Opportunity Atlas, a census-tract-level map of the probability that a child born in the early 1980s to parents at the 25th income percentile reached the top quintile in adulthood. The geographic variation is enormous and intranational: the odds of climbing from poverty to affluence differ by a factor of several between commuting zones a few hundred miles apart.

Five characteristics of a childhood commuting zone track upward mobility: lower racial and economic segregation, lower income inequality (a smaller middle-class gap), stronger family structure (more two-parent households), higher school quality, and greater social capital (measured by membership and network indices). These correlations do not by themselves establish causation, but convergent evidence — from the Moving to Opportunity housing experiment, in which children who moved to lower-poverty neighborhoods before age thirteen earned significantly more as adults — supports the view that place shapes mobility through identifiable mechanisms, not through the traits of individual families.

The Great Gatsby Curve

Alan Krueger named the cross-country relationship between income inequality in one generation and intergenerational immobility in the next the Great Gatsby Curve: more unequal societies reproduce their inequality more faithfully across generations. The relationship is consistent with the mechanism that when the rungs of the ladder are farther apart, the distance a child must climb from a given starting point is larger, and the institutional investments required to bridge it (schools, health, networks) are more unequally distributed. The curve is descriptive and contested in its causal direction — inequality may cause immobility, immobility may entrench inequality, or both may follow from a common third factor — but the association is robust across the OECD samples for which comparable elasticities exist.

Piketty's two laws and patrimonial capitalism

Piketty's framework rests on two accounting identities. The first fundamental law of capitalism is $\alpha =r\times \beta$, where $\alpha$ is capital's share of national income, $r$ the rate of return, and $\beta$ the wealth-to-income ratio. The second law states that in the long run $\beta =s/g$, where $s$ is the saving rate and $g$ the growth rate. When $g$ falls — as it does with slowing population and productivity growth — $\beta$ rises: the stock of wealth swells relative to annual income. If $r$ does not fall proportionally, $\alpha$ rises, and capital claims a larger share of output. The combination is the engine behind the $r>g$ concentration. Piketty's historical claim is that the egalitarian mid-twentieth century was the exception, produced by war, depression, and redistributive policy, and that the twenty-first century is reverting to a patrimonial capitalism in which inherited wealth again dominates. The normative reading — that this is unjust — is separable from the positive account; the data stand independently of any redistributive conclusion one draws from them.

Wright's class schema and exploitation

Wright's twelve-class schema refines the Marxist binary by crossing three dimensions: ownership of capital assets, control of organizational assets (authority), and possession of skill or credential assets. The result locates owners, the petty bourgeoisie, expert managers, traditional managers, supervisors, semi-credentialed supervisors, and several positions among workers, including the contradictory locations — managers and supervisors who are exploited as labour (no ownership) yet benefit from organizational and credential rents. Wright treats exploitation as centered on the expropriation of surplus labour, which makes his framework antagonistic in structure where Weber's is plural: classes are not gradations but positions defined by opposed interests. The empirical payoff is that contradictory locations predict political behavior — managers tend to align with capital on some issues and labour on others — that a unidimensional prestige scale cannot capture.

Bourdieu: distinction, capital, fields

Bourdieu's Distinction (1979/1984) treats cultural consumption as a class practice rather than an aesthetic one. Taste — in food, music, art, furnishings — functions as a marker of social position, and what counts as "natural" or "refined" taste is the taste of the dominant class, legitimized as universal. He distinguishes three states of cultural capital: embodied (dispositions of body and mind, the habitus), objectified (books, instruments, paintings), and institutionalized (degrees, credentials). Social capital is the network of relationships mobilizable for advantage; symbolic capital is recognition — the form any capital takes when it is perceived as legitimate rather than arbitrary. Each field (art, law, education, business) has its own conversion rates among these capitals and its own dominant logic. The analytic consequence is that class reproduction does not pass only through money; it passes through the school system, which rewards the embodied cultural capital of dominant families as if it were innate talent (cf. Lareau 2003 on concerted cultivation). Ansell's work on admissions shows the parallel operation of a cultural premium afforded to wealthy applicants whose ease with elite codes reads as "fit," a premium not reducible to test scores.

Race and class: contending frameworks

The relation between race and class is a standing dispute. William Julius Wilson's The Declining Significance of Race (1978) argued that for some outcomes — employment, inner-city poverty — class had overtaken race as the operative cleavage, a claim intended to redirect policy toward universal economic programs. The argument drew sustained dissent. Bonilla-Silva's Racism Without Racists (2003) contends that color-blind ideology preserves racial hierarchy by refusing to name it, so that ostensibly class-based outcomes remain racially structured. Oliver and Shapiro's Black Wealth/White Wealth (1995) demonstrates that the racial wealth gap cannot be explained by income, education, or family structure, locating the mechanism in centuries of asset exclusion. The synthesis most consistent with the evidence is racialized class structure: race and class are not rival explanations but co-constitutive, with racial exclusion shaping the class position into which families are sorted and class position conditioning how racial disadvantage is experienced.

Mobility policy and its limits

Policy aimed at mobility falls into several families. Place-based interventions follow Chetty's findings — the Moving to Opportunity experiment, desegregation, investment in school quality and social capital. Asset-based interventions target the wealth gap directly: Darrick Hamilton and William Darity's baby bonds would endow each child at birth with resources scaled to family wealth, structurally counteracting inheritance. Education is the conventional mobility engine, but Bowles and Gintis's correspondence principle (1976) argues that schools reproduce the inequality of the workplace — credential inflation and the hidden curriculum convert classed dispositions into apparent merit. Inheritance and estate taxation bears directly on patrimonial dynamics, though it is politically contested. None of these is a complete solution; the evidence indicates that mobility responds to multiple, interacting levers, and that no single instrument reliably closes gaps produced over generations.

Global stratification

Immanuel Wallerstein's world-systems theory (1974) locates class at the scale of the global economy: a core, a periphery, and a semiperiphery linked by an unequal division of labor in which surplus flows from periphery to core. Dependency theory and the analysis of global value chains extend this picture: the price structure of manufactured goods against primary commodities, and the capture of high-value segments (design, finance, branding) by core firms, reproduce international inequality without requiring formal colonial control. Piketty's Capital and the World Inequality Reports apply the same $r>g$ logic globally, finding that between-country inequality, while still vast, is now declining as within-country inequality rises — the composition of global inequality is shifting even as its magnitude remains extreme.

Class and health: the gradient and fundamental causes

The Whitehall studies of British civil servants (Marmot and colleagues) established a health gradient running through the non-poor: even among office workers with stable employment, each step down the occupational hierarchy carries higher risk of disease and earlier death. The gradient is not explained by smoking, diet, or access to care alone. Link and Phelan's fundamental cause theory (1995) argues that class affects health through multiple mechanisms that change over time — when one risk factor is neutralized, class finds another — because what persists is the resource itself (money, knowledge, power, networks), which is flexible enough to exploit whatever health-relevant advantage the current environment offers. This explains why the health gap survives every specific epidemiological transition.

Connections across the curriculum Master

This unit sits downstream of the stratification overview and feeds several later units.

The prerequisite 30.04.01 establishes the five axes of stratification — class, race, gender, caste, global position — and intersectionality; this unit deepens the class axis by formalizing its measurement and mobility dynamics.

The declared successor 30.04.03 pending extends the analysis to the intersection of class with race and ethnicity, where the racial wealth gap documented here becomes the central object. Class structure does not operate independently of racial structure; the two are co-constitutive, and the mobility rates reported for the United States as a whole conceal sharply different odds by race.

The institutions unit 30.05.01 takes up the mechanisms — education, labor markets, the family — through which class is reproduced. Bowles and Gintis's correspondence principle and Lareau's concerted cultivation, introduced here as class-reproduction mechanisms, reappear there as institutional processes.

The deviance and social control unit 30.06.01 examines the criminal justice system as a stratifying institution. Mass incarceration disrupts the wealth accumulation and family formation on which intergenerational mobility depends, so the mobility analysis here supplies the baseline against which carceral effects are measured.

The urbanization and demography unit 30.08.01 covers the residential segregation that Chetty identifies as the first of five mobility-shaping factors. The geography of opportunity is, in significant part, a geography of housing markets, zoning, and neighborhood effects.

Historical and philosophical context Master

Class analysis formed alongside industrial capitalism. Marx's Capital (Vol. I, 1867) gave the first sustained structural account: class as relation to production, with exploitation as the mechanism generating accumulation and the bourgeoisie–proletariat divide as the fundamental conflict ^{[Marx 1867]}. Weber's Economy and Society (1922) broke the account into class, status, and party, the better to handle the proliferating middle strata that industrial society produced and that the binary could not locate ^{[Weber 1922]}.

The mid-twentieth-century American discipline turned toward measurement and function. Davis and Moore (1945) defended inequality as functional — it motivates the talented to fill demanding positions — and was answered by Tumin (1953), who argued that stratification wastes talent in lower strata and legitimates domination. C. Wright Mills's The Power Elite (1956) traced the interlocking of corporate, military, and political leadership. Occupation-based scales (the British Registrar General's classification, Duncan's SEI) made class quantifiable and tied it firmly to gradients in health and attainment, at the cost of the relational structure Marx and Weber had sought.

Bourdieu's Distinction (1979) and The Forms of Capital (1986) shifted reproduction theory toward culture: taste, credential, and network as class-bearing assets passing through families and fields. Wright's Classes (1985) and Class Counts (1997) rebuilt the Marxist schema with contradictory locations, recovering the political behavior of managers and supervisors. Piketty's Capital in the Twenty-First Century (2014), built on the World Top Incomes Database assembled with Saez, reconstructed two centuries of wealth and income concentration and gave the $r>g$ formulation that now organizes the field ^{[Piketty 2014]}. Chetty and colleagues' use of population-scale tax records (2014, 2017) moved mobility measurement from sample surveys to near-universal longitudinal data, exposing tract-level variation that aggregate national figures had hidden ^{[Chetty et al. 2014]}.

The standing philosophical question is whether inherited advantage is unjust, and if so what may permissibly be done about it. Rawls's difference principle, Nozick's entitlement theory, and Sen's capability approach supply competing frameworks; Piketty's positive analysis is consistent with several of them and commits to none. The empirical record does not settle the normative dispute, but it constrains it: any defensible account must reckon with mobility rates that vary systematically by birthplace and parentage.

Bibliography Master

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