Discrepancies in the performances of the secondary education systems are relevant, it is even more so when connected with social mobility. From all the countries that have been studied, the United States is the one where the gap between the academic performance of wealthy and poor families remains the widest, as if American education was not good enough to help the intellectual and social elevation of the children with a humble background. At the opposite end, Canada, South Korea and the Scandinavian countries are where the children have, despite belonging to different social classes, the most similar results, thus showing that the education they are receiving is comparable whether they are from a rich or poor background.