Boliver (2011) showed descriptively that social class inequalities in British higher education were both maximally maintained (MMI) and effectively maintained (EMI) between 1960 and 1995: class differentials in the odds of enrolment persisted until the most advantaged class reached saturation in the early 1990s, while class differentials in enrolment at 'Old' universities and in higher-status degree subjects never narrowed. Because MMI and EMI are descriptive hypotheses that do not specify the causal processes generating this pattern, the explanatory question - and the open core surviving a decade and a half of subsequent research - is which causal mechanisms produce it: how advantaged social origins convert educational expansion into both quantitative and qualitative advantage. Later work has documented the persistence of both forms of inequality beyond the source's analytic window (Boliver 2013; Croxford & Raffe 2014; Raffe & Croxford 2015; Paterson 2022) and has decomposed class gaps into prior-attainment ('primary') effects and residual choice and selection ('secondary') effects (Chowdry et al. 2013; Jerrim et al. 2015), but the specific causal processes - differential conversion of family resources into prior attainment, application behaviour, admissions selection, information and aspiration formation - remain unidentified, a gap recent literature explicitly acknowledges. The problem is to give a causally identified, quantified account of these mechanisms for British higher education.

Background

A central question of the sociology of education and social stratification is why inequalities in educational attainment by social class origin survive the expansion of educational systems. Two hypotheses frame the field. Maximally Maintained Inequality (MMI), proposed by Raftery and Hout (1993) from the Irish experience of 1921-75, holds that expansion does not reduce class differentials in the odds of reaching a given educational level so long as advantaged classes still have unmet demand for that level; differentials decline only once the advantaged approach saturation. Effectively Maintained Inequality (EMI), proposed by Lucas (2001) from US schooling, holds that even when a level of education becomes nearly universal, advantaged classes secure for themselves qualitatively superior versions of it - selective tracks, programmes, or institutions - so that inequality is maintained through vertical (qualitative) differentiation. Both are deliberately descriptive claims about what happens to inequality during expansion; neither specifies the causal processes - in family resources, information, aspirations, or institutional selection - that generate the pattern. British higher education is a canonical test case: it expanded sharply in the 1960s and again around the early 1990s, when the 1992 Further and Higher Education Act converted polytechnics into ('post-1992') universities alongside the older chartered ('pre-1992' or 'Old') universities, roughly doubling participation within a decade. Boliver (2011) tested MMI and EMI on Britain using retrospective educational histories from the British Household Panel Survey (BHPS), a nationally representative household panel interviewed annually from 1991 (with the higher-education institution attended recorded at wave 12), fitting logistic models of higher-education entry by hypothetical enrolment year, with spline interactions (interaction terms built on piecewise-smooth curves that allow the year trend to bend at expansion-period cut-points) between enrolment year, expansion-period segments, and social class. She found quantitative class inequalities in the odds of enrolment persistent from 1960 until the early 1990s, when they began to decline only after the most advantaged class reached saturation - the MMI prediction - and qualitative class inequalities in the odds of attending an 'Old' university and enrolling on traditional, higher-status degree programmes fundamentally unchanged throughout - the EMI prediction. The paper itself presents this as a descriptive confirmation, and its apparatus (acknowledged in its reference list and endnotes) carries known limitations: the data are retrospective and cross-sectional, with risks of selection bias across cohorts; the analytical window ends with enrolment years through 1995; and the recommended spline-interaction approach involves hard-to-interpret higher-order interactions. The follow-up literature is organised around a standard distinction between 'primary' effects - class differences in school performance that precede educational choices - and 'secondary' effects - class differences in choices (application, field, institution) made at a given level of performance; identifying which of these channels, and which mechanisms within them, actually carries maintained inequality is the unresolved target.

Problem Statement

Boliver (2011) established descriptively that class inequalities in British higher education were maximally and effectively maintained between 1960 and 1995. Because MMI and EMI are descriptive claims that do not specify the causal processes generating the observed patterns, the explanatory account remains the open problem: identify and empirically test the specific causal mechanisms through which social-class origin maintains (a) quantitative advantage in higher-education enrolment - whose erosion lags expansion until the advantaged classes approach saturation - and (b) qualitative advantage within the institutional and subject hierarchy of the system. The explanatory account sought is one that (i) names the operative mechanisms - for example differential conversion of family resources into prior attainment, application and choice behaviour at the point of entry, admissions selection, and information or aspiration formation; (ii) establishes their causal role with a credible identification strategy appropriate to, and defended for, the data used, rather than cross-sectional association; and (iii) quantifies each identified mechanism's contribution to the observed patterns of class differentials in enrolment and in access to higher-status institutions and fields. An explanatory account of maintained inequality is a single account of all three components, each necessary to it: descriptive re-documentation of persistence, or a decomposition into explained/unexplained shares without causal identification of the channels, would not by itself provide the explanation.

References

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