Pedro Domingos

Outcomes are a function of both ability and opportunity, both of which vary within each country. If you ignore ability, you imagine greater differences of opportunity than are really there. Is that clear now?

Social mobility in the US has gone down precisely because the US is ahead of Europe in matching ability to outcomes, assortative mating, etc. (And Piketty is a joke.)

Or, it could be because inequality has grown so much larger, with the powerful rigging the system in their favor. I'll have to reflect more on that. (And much of Piketty is simply showing historical trends in economics -- you don't like the descriptive stats?).

Piketty is cherrypicking and manipulating data to fit a preconceived theory that no serious economist believes in anyway.

You said no serious economists take Pikertty seriously and I gave you two Nobel Prize winners. Now you point out that some do not? Anyway, back to the claim that US has less social mobility because of assortative mating.