Comment by tzs
What about poor countries? If a drug company had to sell drugs for the same price in the US and a country like Sudan, the result would almost certainly be raising the price in Sudan up to US prices rather than lowering the price in the US to Sudan prices.
That would put the drug out of reach of most of the people in those poor countries.
They could benchmark the price against comparable countries/regions. Pay no more than, say, 110% of the average cost of the drug in Europe.