Which single intervention would do the most to improve the health of those living on less than $1 per day? Interview by Gavin Yamey

Invited commentary on... Mental health research priorities in low- and middle-income countries

There are huge inequalities in health research within and between countries. It is argued that this may hinder the process of setting and tackling mental health priorities. If this were true, establishing research priorities would be important. However, this is not a simple process and one must be aware of its limitations. Despite a plethora of declarations, funding for mental health research in low- and middle-income countries remains hard to find. In the absence of funding, establishing research priorities is seen by many as an exercise of lesser importance.

Thirty ways to improve the health of the world's poorest people

The editors discuss a special collection of articles inPLoS Medicine that aims to highlight the profound influence of poverty upon health.