[graemep]

What is their definition of self made? Zero inherited wealth? I doubt it. People who crossed the threshold? You can do that sitting on investment gains.

CEOs and billionaires are different groups. Those willing to take part in a study are not a random sample. Its a sample sample too. The numbers depend on self reporting.

You are buying into the myth of wealth going to those who create it. Most wealth is accumulated by being on the right end of transfers,and pricing power.