Investing to Save Lives

I un­der­stand that donat­ing can save lives in de­vel­op­ing coun­tries, per­haps as low as hun­dreds of dol­lars per life saved.

If that’s true, is the limit­ing fac­tor re­ally get­ting enough fund­ing, or is it some­thing else like lo­gis­ti­cally get­ting vi­tam­ins, anti-mosquito nets, etc to the peo­ple?

And if fund­ing re­ally is a limit­ing fac­tor, why isn’t there an in­vest­ment or­ga­ni­za­tion that one could buy bonds from, which would then save peo­ple’s lives as a loan, and ask them to re­pay it back over a medium term time frame? I know that la­bor in de­vel­op­ing coun­tries is poorly com­pen­sated, but if the cost to save a life is re­ally just hun­dreds of dol­lars, then surely the la­bor could pay that back prof­itably over some time frame?

Is there some­thing like this already?