Wealth tax

We "enjoy uncommon fortunes, but each of us wants to live in an America that solves the biggest challenges of our common future," notes the plea.

"Some part of that wealth that has been built up and continues to be built up and receives favorable preferential treatment in the tax code must be taxed for our common benefit," the presidential candidate said in South Carolina.

Most Americans are on board with the belief that the government should work to reduce the wealth gap,

“U.S. wealth concentration seems to have returned to levels last seen during the Roaring Twenties,” economist Gabriel Zucman wrote.