It has long been accepted that, as people grow richer, their health tends to improve. However, in recent years, researchers have accumulated increasing evidence that this "wealth-health" link also works in the other direction: better health can lead to greater wealth too. Governments and others who invest in public health in a rational way, and particularly in the health of the poorest, reap rewards in better productivity and economic growth.

• A summary of the research evidence showing that improved health has economic benefits
• A summary of some recent studies on the cost-effectiveness of immunization as a health intervention
• Other sources in health and economic development