Consider the following: 1. A high infant mortality rate brings average lifespan down. 2. Infants don't contribute to the economy nor to public pension funds.

Consider the following: 1. A high infant mortality rate brings average lifespan down. 2. Infants don't contribute to the economy nor to public pension funds. A country might have low life expectancy, but a relatively close number of workers and retirees, as life expectances can be (even more so in developing countries) multimodal.