If an increase in tax funding to provide Medicare for all more than offsets the expenses of purchasing health insurance from private companies like Obamacare does, wouldn't that be worth it to you?  Let's face it, Healthcare is not subject to free-market economics.  Demand cannot be increased or decreased by the normal factors of price competition, marketing, product supply, or product improvements and thus the normal ways to generate profit don't work.  Therefore, what factors influence insurance premium price in the private insurance market?  It's not like being able to go down the street to buy your gas because its a few cents cheaper per gallon.