All else being equal, that is true. However, our economic system quite disproportionately rewards the wealthy; if you are born rich, it is extremely easy to pay a financial manager to invest your money and get huge returns - returns earned passively. Most wealthy Americans are not first-generation entrepreneurs who single-handedly (if that is possible) produced millions or billions in value from a background of poverty. It’s an oversimplification to ignore the complex picture of inequality.