The wage gaps between rich and poor countries exist not mainly because of differences in individual productivity but mainly because of immigration control. If there were free migration, most workers in rich countries could be, and would be, replaced by workers from poor countries. In other words, wages are largely politically determined. The other side of the coin is that poor countries are poor not because of their poor people, many of whom can out-compete their counterparts in rich countries, but because of their rich people, most of whom cannot do the same. This does not, however, mean that the rich in the rich countries can pat their own backs for their individual brilliance. Their high productivities are possible only because of the historically inherited collective institutions on which they stand. We should reject the myth that we all get paid according to our individual worth, if we are to build a truly just society.
it's true, but he could go deeper into what it means for some countries to be rich or poor if it has nothing to do with individual productivity