Gregory Clark (who you should remember from the excellent "A Farewell to Alms") has some new research out looking at the historic rates of social mobility. A good summation of that is here, in the NY Times. Worth reading that but the short version is that social mobility has been very low across societies and history. The current day is not real change from those historical numbers.
It's a sad thing to have to say but, sadly, every single word in that video above is a lie. And this is not just to say that of course all acting is a lie: it is to say that the entire basis upon which Oxfam is operating here is incorrect and also that they know that they are incorrect.
One of the sadder things I've seen over the past few years has come from a coterie of left leaning US economists. They have been insisting that the extension of unemployment benefits (usually in the US they are only payable for 26 weeks, it was extended to 99) has had no effect on the unemployment rate. This is of course untrue:
The New York Times is complaining bitterly that the workers at the VW plant in Tennessee didn't do what the NYT think that the auto workers should have done. That is, they voted not to have a union to represent them: