Mobility of men and activities: a society on the move: the case of Languedoc-Roussillon: thesis on work.

Summary This thesis, composed of two volumes, is a synthesis of the author's work on migration and mobility in Languedoc-Roussillon since 1970 (volume 1) and a selection of his publications (volume 2). In the first part, the author sets out to define the framework for the analysis of migration: its scope, its forms and the techniques used to observe and measure it. The second part focuses on the various theoretical approaches used to analyze population movements. If the angle of attack was initially macro-economic and focused on economic reasons, with an emphasis on income and employment, the theory gradually turned to a micro-economic vision. Research has then focused on refining the causes of migration by highlighting extra-economic causes, including amenities. However, we must note that theorists are less interested in the consequences of migration. The last part of volume 1 rereads the author's work to show its coherence. 25 years of observation of migrations in Languedoc-Roussillon show through the presented works, briefly summarized, that this region is a space favorable to migration and exchange. Migration has had and still has consequences for the demography and economy of this region. This work concludes with a thesis: Languedoc-Roussillon, in its economic organization and its animation driven by migratory movements, should be considered as a model for other French regions. A second volume gathers a selection of the publications used or evoked throughout the synthesis work.