So, I was curious. I looked up what percentage of the Forbes 400 is ‘self-made’ and it turns out to be about 60%. If measuring as coming from a middle-class background with no inheritance of the wealth.

https://www.forbes.com/sites/rachelsandler/2021/10/05/the-forbes-400-self-made-score-2021-from-silver-spooners-to-bootstrappers/?sh=2b960ac730c2