Purpose This paper aims to propose a dynamic multidimensional approach to identify the middle class and then to reliably study the structural changes that have marked it in terms of demographic and socioeconomic characteristics and aspirations. Design/methodology/approach This study uses Moroccan data from the 2007 and 2014 household expenditure surveys. The method consists in applying a factor analysis of mixed data on a set of variables inspired by Bourdieu’s concepts of social space and forms of capital, then performing a hierarchical ascending classification consolidated by the k-means clustering, along with adopting the same indicators and weighting for both years studied to ensure reliable comparison. Findings The classification results identified three social classes whose changing size reveals a decline of the lower class and an expansion of the upper and middle classes. Some characteristics of the middle class are becoming close to those of the upper class, like fertility behavior, while a significant gap remains between the two classes in other characteristics, like education. Moreover, middle-class perceptions reflect their downgrading, confirming that the so-called decline of the middle class is more related to feelings than to objective realities. Originality/value Middle class studies are generally based on a single criterion (income or consumption) with somewhat arbitrary boundaries that are often ill-suited to developing countries. This paper proposes a new dynamic multidimensional approach to overcome these problems while adopting a new technique for reliable intertemporal comparisons.