Look to the nervous system as the key to maximum health. - Galen
The US is the largest manufacturer and consumer of pharmaceuticals and spends the most on research & development. The most logical result follows. American companies are fetching the most revenues from around the world.
The industry comprises of patented drugs, generics, and biosimilars. Generics are drugs identical in chemical composition to the original medicines, and biosimilars are close enough.
In the absence of direct competition, patented drugs are destined to be more expensive, which is why government policy mandates the existence of