[twanvl]

> You should be more concerned with what a given charity's administrative overhead is.

If charity1 has a 20% overhead and then spends the rest on saving the life of a child for every 1000$, while charity2 has a 40% overhead but saves a child for every remaining 500$ spent, which one is better? Overhead is just one factor of a charity's efficiency.

Of course in this case the cost of the powder is just a small factor, and you also need to consider the cost of distribution and other overheads. And the fact that the effectiveness probably drops off at some point. Obviously just spending 1B$ is not going to save 20 billion children, there aren't that many children that need these ORS packets.