It's also an extremely misleading, if not stupid, measurement of what they are claiming. They take the earnings of new self-made billionaires, and contrast that

It's also an extremely misleading, if not stupid, measurement of what they are claiming. They take the earnings of new self-made billionaires, and contrast that against the amount passed down to heirs, in a given year. You're looking at the earnings of brand new billionaires, contrasted against the lifetime earnings of recently deceased billionaires, and seeing which is bigger. There is no way that this will not trend towards always favoring the lifetime earnings, especially as the ratio of total_billionaires : new_billionaires continues to increase.