largen see trust funds, pieces of inherited wealth. sometimes you do not see them as much as you should because it is harder to spot inherited wealth. self-made billionaires want to be seen. sometimes they don't. it is harder to spot them in rankings. i can tell you you can see a return of inherited wealth. number two, the following, ,hether it is inherited wealth if you have an economy where the top of the wealth distribution, wherever they come from, rice three times faster than the size of the economy, you can see you have a problem. ofs means the concentration wealth at the top is rising very fast. this will have to stop somewhere. >> will it create social tension? saysere is a law that there is a tipping point where the world is going to fall apart. useful only up to a point. when it gets too extreme, then it is bad for growth because it limits mobility and the ability of new groups and also it tends to have consequences for the political process. unequal access to the political voice. >> one of the loud cries over the last 10 yea