I'm surprised this is not getting more attention.
It's a intricate topic.
From what I understand from years gone by is that drug companies can't police their IP on the entire world so they get it from the same place that makes it cheapest and charge what they want in the USA. Or. They could make it themselves, which would cost more and the rest of the world will rip of their IP and sell it for way less anyway .
That's the short version.
USA drug companies are gauging and they are a monopoly protected by the artificial barriers they have put in place through government lobbying and buying of the media through adds , however they are kind of fucked if the whole world just ripped of their drugs and they can't do shit about it .
It's a sticky situation. A lot of fuckhead libitarians like myself don't believe in IP rights and tariffs yet there is a shity outcome if you go down that route.