So you automatically dismiss someone just because they disagree with the reported finding of the study. Yet I'm the person who is picking and choosing what I want to believe?
Did you even read what I posted? This is a direct quote from the Mercatus study:
For example, in 2014, hospitals were reimbursed just 89 percent of their costs of treating Medicare patients
https://www.mercatus.org/system/files/blahous-costs-medicare-mercatus-working-paper-v1_1.pdf (page 11 if you're curious)
This alone should lead you to believe that covering everyone with Medicare should result in an ~11% decrease in provider payments, not 40%.