Abstract
The Demographic Dynamics of Family Structures: A World View
The major changes made in the evolution of populations of the world in the twenty-first century are: demographic transition and fertility de- cline, very few families in some countries as “demographic winter”, ur- banization changing the exercise of family solidarity, effect of migrations on families, aging posing the question of solidarity between generations. It is important to explain why the marriage rate decreases in the world as cohabitation increases.Yet the family remains the basic institution for the education of children around the world. We must therefore ask what pol- icies would foster families.