"Rather than give a detailed proposal about how we're going to raise $3 trillion a year, we'd rather give the American people options," Sanders said. "The truth is, embarrassingly, that on this enormously important issue, there has not been the kind of research and study that we need.You've got think tanks, in many cases funded by the drug companies and the insurance companies, telling us how terribly expensive it's going to be. We have economists looking at it who are coming up with different numbers."