Alex Wong/Getty Images(CNN) - The cost of Sen. Bernie Sanders' "Medicare for All" national health insurance plan prompted a heated argument between the senator and former Vice President Joe Biden, who supports building on the Affordable Care Act, at Thursday's Democratic presidential debate.
Biden hammered Sanders, saying America can't afford the roughly $30 trillion price tag for his plan.
But overall spending on health care would be expected to go up under Medicare for All, since everyone would be covered.
Currently, health insurance isn't cheap.
The average family spent about $4,700 on premiums and $3,000 on cost-sharing in 2018, according to the Peterson-Kaiser Health System Tracker.