In 2009, during the height of the debate over Obamacare, the law’s architect, MIT economist Jonathan Gruber, was all over the op-ed pages, talking about how the bill would reduce the cost of health insurance. “What we know for sure,” he told Ezra Klein, “is that [the bill] will lower the cost of buying non-group health insurance.” His words were trumpeted by the law’s advocates, and were critical to persuading skittish Democrats to vote for the bill. But it turns out that “for sure” doesn’t mean what you thought it did. Because, now, Gruber is quietly telling state governments that the law will significantly increase the cost of insurance. And it will especially do so for young Americans: the ones who most struggle to find affordable health coverage.