Population without double counting
In France, because of the census, the INSEE has allowed people who live in one place and study in a different place to be counted twice, so as to show how the population moves. Because of this, each commune in France has many numbers of how many people live in it. For example, students may be counted where they study and where they live but do not study (the place they were born in). It is just like allowing students in the United States to vote in the town election of the place they are studying in and the town election where they were born.