American billionaires are calling for changes to the system that enabled them to get rich. Warren Buffett, Jamie Dimon, Ray Dalio, Bill Gates and a list of others say that capitalism in its current form simply doesn't work for the rest of the United States. Some of their remedies involve higher taxes. Hedge fund titan Ray Dalio is the most recent to criticize the current economic system. On Monday, the Bridgewater founder told CNBC that while it doesn't need to be destroyed, capitalism does need to present an equal opportunity, which Dalio said he received through public education. The issue chafing billionaires and politicians alike is a growing income gap. The inequality between rich and poor Americans is as high as it was in late 1930s, Dalio pointed out in a paper posted online. The wealth of the top 1 percent of the population is now more than that of the bottom 90 percent of the population combined. Dalio called growing inequality and lack of investment in public education "an existential risk for the U.S." Berkshire Hathaway CEO Warren Buffett - third on Forbe's 2019 billionaires list - has repeatedly said the wealthy should be taxed more. In 2006, the CEO committed to give all of his Berkshire Hathaway stock to philanthropic foundations. He and Bill and Melinda Gates have asked hundreds of wealthy Americans to pledge at least 50 percent of their wealth to charity in the so-called "the Giving Pledge." There are now 190 people signed on, including Facebook CEO Mark Zuckerberg and Netflix CEO Reed Hastings.