Poor countries are starting to realize something that richer ones sometimes forget: Basic, inexpensive measures can have dramatic impacts on the health of a country. And they can save thousands of lives.
Take, for instance, the situation in Ethiopia.
The country used to have one of the highest rates of child mortality in the world.
Earlier this summer in the Ethiopian capital Addis Ababa, I heard a complaint from many professionals that they could no longer find cheap house cleaners and nannies.
The apparently endless supply of girls and young women from the countryside who would work for peanuts just for a chance to move to the capital was drying up. It turns out more and more of them are finding work on one of the city's many construction sites.