he most recent gains have been fueled by the continued rise of the stock market since Biden was sworn in Jan. 20, along with the vaccination program's fast rollout and a $1.9 trillion government stimulus package. The S&P 500 and Dow Jones indexes have both climbed more than 10% during that time.

Attempts such as Biden's to refloat the economy can boost incomes and wealth at the very top, said Mike Savage, a sociology professor at the London School of Economics.

"We've seen that paradox since the 2008 financial crash with quantitative easing, which has mostly benefited people with assets, inflating their value significantly,'' Savage said. -Bloomberg