Globalisation is the new canon, the paradigm that has become the interpretative framework of the world. The absolute and relative mobility that is activated in various advanced countries must be examined in the light of global inequality. It is the glaring wealth gaps, which have widened with globalisation in Africa, Asia and Latin America, that, along with the ethnic conflicts and wars that have multiplied in the new century, drive population mobility towards the geographical areas where the rich countries are. The graph in Fig. 9.1, drawn up by Branko Milanović (2024), is very eloquent in indicating in which direction it is how mobility has evolved on the planet for various social groups and what new characteristics social stratification is taking on at a global level. The graph shows on the horizontal axis the values of income (in logarithmic scale) and on the vertical axis the values of frequency (the number of people who are located at each level of income).