I won't get into the intricacies of Sander's policies and funding mechanisms (broadly, I agree with some, and think others are irrational).
But I will speak to health policy. America currently spends over double the amount per capita on health that Australia does. In fact, America spends nearly double the amount per capita that any other nation spends.
Despite this, America's health outcomes do not compare favourably to most OECD countries.
It would require a wholesale overhaul of the US Health system to fix this, but its important to note that most of the systems the US is competing (and losing badly) against are single-payer universal health systems.
As a share of GDP, the USA spends some 17% of its GDP on health every year. For comparable nations, this is 9.1% (UK), 9.4% (Australia) and 11.3% (Germany). Again, all of these countries have better outcomes.
Put another way, even if the short term cost to the economy of a dramatic shift in the nature of the system towards universal care was extremely large, the cost savings (and social improvement) from getting down close to the rest of the developed world (say, 10% of GDP) would be over $1 TRILLION per year.
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