Heterogeneity of demographic behaviour in contemporary societies: individualization, variability, and inequalities (1800-2000) This collective work looks at the ways population is shaped, over the life course, by law, public policies, science, and various institutions. The aim is to dissect, and requalify, the dominant view from contemporary demographic history elaborated around “great transformations”, that promote a monolithic, linear reading of demographic phenomena. In so doing, it tends to obscure the vast diversity of these phenomena. For instance, the important variations in fertility, during and after the transition, demonstrates the need to confront different approaches in order to move away from reductive theories with little explanatory power. The researchers involved in this project have set themselves the objective of studying the inequalities linked to these changes, by inscribing them in the individual life course, but also in the long course of successive generations. Members List Head of Units Fabrice Cahen Senior researcher Lionel Kesztenbaum Senior researcher Luc Berlivet Emmanuel Blanchard Associated researcher Jérôme Bourdieu Keith Breckenridge Marie Derrien Yannick Dupraz Associated researcher Gilles Guiheux Yuliya Hilevych Agnès Hirsch Affiliated PhD Adrien Minard Julia Moses Blanc Paul Gilles Postel-Vinay Mathilde Rossigneux-Méheust Associated researcher Akiko Suwa-Eisenmann Research unit History and Population Research activities Research projects Ongoing Projet NATIO² - CT project_search - ID 1147 NATIO² - CT project_search - ID 1147 Ongoing Projet SOCFACE - CT project_search - ID 1148 SOCFACE - CT project_search - ID 1148 Updated on 23 September 2026