You're presented with a five year-old who probably has appendicitis. The family is poor, does not have medical insurance, and they only have a small amount of money to cover diagnostics and treatment of their child. (Any veterinarians on this forum?)
Because of the OMG free market stuff, you can remove the child's appendix for a minimum of...$5,000. However, this child's family cannot afford that and are not eligible for that much credit.
...what do you do? What if you're presented with ten such cases over the course of a month?