The number one cause of bankruptcy in the United States:
> "medical expenses"[0]
The average amount charged for an ER visit in the United States:
> between 2008 and 2017, the average price of hospital ER visits rose 135 percent, from $393 to $924[1]
The cost of an ambulance ride in the United States:
> $164/mile[2]
And make sure to compound the monetary cost with the cost of people avoiding medical care out of fear and unknowns surrounding the actual monetary cost.
[0] take your pick of any study done by anyone
[1] https://www.beckershospitalreview.com/finance/average-cost-o...
[2] https://www.consumerreports.org/consumerist/164-per-mile-sur...