With an increase in the size of regions, the new breakdown logically reduces regional differences on both a demographic and economic level. For example, the regions with the oldest populations are merging with regions where aging is less pronounced: Limousin and Poitou-Charentes with Aquitaine, Auvergne with Rhône-Alpes. Meanwhile, Nord - Pas-de-Calais Picardie and Alsace Champagne-Ardenne Lorraine have a higher natural population growth than other regions, whereas for Aquitaine Limousin Poitou-Charentes and Languedoc-Roussillon Midi-Pyrénées, the population change results mainly from an attraction effect through migration intake, as is also the case for the constituent regions. In addition, regional value added was strengthened in the sectoral structures. Similarly, given the differences between the regions grouped together, the GDP per capita of these new sets is more around the national average. Among the merged regions, the growth of regional GDPs over the last twenty years has been close to or above the average increase for the Auvergne Rhône-Alpes, Aquitaine Limousin Poitou-Charentes and Languedoc-Roussillon Midi-Pyrénées regions. Compared to their European neighbours, the new French regions have high population levels.