A couple of points need to be considered about Dr. Friedman's analysis, and his objectivity.  Dr. Friedman was asked by the Sanders campaign to analyze the Single Payer plan they proposed.  Dr. Friedman is a long time public advocate for a single payer health care system.  He is a long time board member of a national organization called Single Payer now.  It is quite possible that he is less than unbiased in his view of such plans.  When asked for details, Friedman said that as an academic he shunned details.  He said that details made things messy.  We should hardly commit ourselves to a program that some say will cost $2-3-trillion more than stated, based on his biased and incomplete analysis.