When market forces of supply and demand become involved with parts of the human body, the result can be a high degree of ambivalence. In the US, for example, a system has evolved where the health care system primarily relies on volunteers for blood, but on paying those who donate blood plasma. Not coincidentally the system of paid US now supplies nearly two-thirds of all the blood plasma available in the world.
Intergenerational economic mobility has two aspects. "Absolute" mobility refers to the difference between one generation and the next. In an economy that grows substantially over time, absolute intergenerational mobility can be widespread--that is, most adults currently in the workforce would have higher income than did their parents at the same age. In contrast, "relative" mobility refers to whether the ranking of current adults--say, whether they are in the top 10% or the bottom 10%--is correlated with the ranking of their parents.
Everybody loves to hear stories of great modern leaders like Alan Mulally, Howard Schultz, Bill McDermott, Casey Crawford, or Coach Mike Krzyzewski.