Can a trio of billionaires save American health care?

America's health-care system is a mess. Can three billionaires save it? Jeff Bezos' Amazon (market capitalization: $693.2 billion), Warren Buffett's Berkshire Hathaway (market capitalization: $530.5 billion), and Jamie Dimon's JPMorgan Chase (market capitalization: $399.8 billion) are teaming up to create an independent company that will provide health care for the three mega-companies' roughly 1 million combined employees. Details remain sketchy. But the news still sent shockwaves through...