I would think that the money would "go further", and the impact of getting the grant vs. not getting it would be greater, in most of Africa compared to, say, th

I would think that the money would "go further", and the impact of getting the grant vs. not getting it would be greater, in most of Africa compared to, say, the Bay Area in California. Not the only basis for consideration, but one might think that the PSF should be prioritizing places where, if they give a grant, it makes a large positive impact on the outcome. I'm no expert, but it seems plausible that this might be more often the case in Africa than elsewhere.