This inequality is a central challenge for the United States today and should be getting far more attention in this presidential campaign. A few snapshots:
• The six heirs of Sam Walton, the founder of Walmart, own as much wealth as the bottom 100 million Americans.
• In 2010, 93 percent of the gain in national income went to the top 1 percent.
• America’s Gini coefficient, the classic measure of inequality, set a modern record last month — the highest since the Great Depression.
“After all, the United States enjoyed strong growth in the 1950s when we were a more egalitarian country, even though the top income tax rate in that decade was always more than 90 percent.”