Main takeaway is that upward social mobility in all of these countries is extremely, dangerously high to the point of making society hardly functional at all. I

Main takeaway is that upward social mobility in all of these countries is extremely, dangerously high to the point of making society hardly functional at all. It should be extremely hard to get from bottom to the top, or people who are at the top will not care about things in society for the long term - coz why if their children will most probably be poor again anyway? And they are those who actually make decisions.