Many severe health risks in developing countries could be substantially reduced with access to appropriate preventive measures. However, the associated costs are often high enough to restrict access among poor households, and free provision through public health campaigns is often not...

Mortality rates have fallen dramatically over time, starting in a few countries in the 18th century, and continuing to fall today. In just the past century, life expectancy has increased by over 30 years. At the same time, mortality rates remain much higher in poor countries, with a difference...