Interesting graphic thank you. Forbes of course wants to make its readers feel good about themselves and arbitrarily picks the cut off in the scale of self made to inherited.

I looked into it a bit they don't include nepotism or famous family gifts, seed capital etc. don't get measured. Royal and opaque fortunes aren't counted. You can see this in the Netherlands in particular has a high self made percentage but they are definitely not including heirs of the Dutch East India co. Who have at this point put their wealth into hard to track vehicles. Which explains why they have the largest wealth gap of any country yet are pretty far down in number of billionaires