Very simple explanation.I don't quite know how this thread shifted this way, but here is a 3rd world/Cozumel health care story.
Years ago my son in his early 20s was still on our family health insurance, and he got an eye infection. He was prescribed a prescription medication, for which we paid our standard $30 co-pay. Several months later the infection returned, and we again paid the standard $30 co-pay.
Several months later we were in Cozumel together, and the infection returned. He went to the local pharmacy and bought exactly the same medication over the counter for $5.
Because the cost of living is lower.
I routinely bought some useful over counter medicines and toiletries(not made in china) when I diving around SE Asia.