“Two years after Congress passed President Barack Obama’s health-care legislation, despite all the assertions about what it will or won’t do, no one really knows how it’s going to work. The U.S. has rarely attempted anything of this scale before. If the law survives the Supreme Court and Republican repeal efforts, its impact turns on what Paul Keckley, head of the Deloitte Center for Health Solutions, a unit of the accounting firm, calls ‘four big bets.'”