Germany has reference pricing for their drugs system and doesn't seem to have a supply issue. Genuine question, is there something that makes you think that wouldn't be true for the US?
Medicines are more complicated because the manufacturer will probably have patents that grant them a manufacturing monopoly, meaning they can always set the price to whatever they want anyway. Not to mention that a multinational can afford to make less in some countries as long as on average they make enough to continue doing research. If Germany somehow sets a price that is egregiously low, the manufacturer can simply sell their medicine elsewhere instead.
The US is too big, too diverse, too whatever else, blablabla for things that work perfectly anywhere else in the world. Nothing can be learned from other countries unless it makes capitalists richer.