The US subsidizes the rest of the world in Medicine, Defense, Technology, etc...
I doubt they sell it so cheap in Mexico to be charitable. Which suggests they're just soaking the US market.
Next they will tell you that they have so many homeless people because they are sending all their houses to Mexico.
the free market is just not the correct way to set drug prices, and never has been.
https://synapse.patsnap.com/article/what-is-serum-antiscorpi...
In the US, they can charge whatever they want because the system is broken, and the influence of money on politics means that it doesn’t get fixed.
They saw Shkreli hike prices 100x and decided that was the business model for them. Same thing has happened with rabies.
Pre-exposure (PrEP) for rabies (a vaccine) is more expensive than it should be due to lack of economics of scale and the typical American medical pricing inflation. That's not unique to rabies, it's just how vaccines are allowed to be priced in the US.
My understanding is poorer rabies prone countries do not even attempt PEP for rabies due to the cost, they really rely on broad PrEP immunity.
PEP is always going to be more expensive than PrEP, because transplanting a vaccinated animal's immune response proteins is a much harder thing to do than getting your body to make it's own.
Approved for medical use in 1968