The rich are getting richer, and this trend has become so pronounced that even the wealthiest Americans, who have reaped the lion’s share of economic gains in recent years, are sounding the alarm bell, MarketWatch reports.

“I think the greatest issue of our time is the disparity of wealth and the problems that exist for the lower 40% of the population,” said Ray Dalio, founder of Bridgewater Associates. Bridgewater is the world’s largest hedge fund, which about $160bn in assets. According to Forbes, Dalio himself is worth about $17bn.