President Obama, the press, all the Democrats and a fair number of the Republicans in Congress share the same assumption about health care. Whatever you believe should be done about the problem, it sure is complicated. Yet, in 2001 the economist Milton Friedman read up on health care, discovered that the inefficiencies in our system trace back to a single policy mistake, worked out a policy test that would help us correct it and then described his findings in a few thousand words of plain English.