Wealth inequality is alive and well in the U.S.—and it’s only getting worse. According to a new working paper on the topic by University of California at Berkeley economist Gabriel Zucman, wealth is distributed even more unevenly than that of income. Zucman’s calculations show that the top 0.1% of the U.S. population possesses close to 20% of the wealth in the country—more than the bottom 80% of the population combined. When expanded to the top 10%, the share of the pie continues to grow:...