About Gilead Sciences and remdesivir.
Gilead Sciences (a name which makes me cringe, for all sorts of reasons) did not develop it on their own: they had at least $79 million of government funding for that bit, ten years and more ago. So the R&D costs were already covered. It has now been declared an "orphan" drug in the USA, which means that for seven years only Gilead is licensed to produce it.
It apparently costs about 12¢ -15¢ to produce and distribute one person's course of this drug. They plan to charge $2,340 per course.
As far as I can make out Trump has arranged for the USA to buy, at Gilead's price, five hundred thousand doses of a drug for which the only real attested claim is that it may (or of course it may not, and there is absolutely no way to show, in any individual case, whether it has or hasn't) reduce the recovery time of a patient by as many as four days.
This purchase may turn out not to be true: I am not sure whose word we have for it apart from that of Trump. But that is what seems to be the state of play, and I would be really pleased if someone could tell me that I am wrong about it!
www.commondreams.org/news/2020/03/24/massive-scandal-trump-fda-grants-drug-company-exclusive-claim-promising-coronavirus