In 2004, a landmark study showed that an inexpensive medication to treat parasitic worms could improve health and school attendance for millions of children in many developing countries. Eleven years later, a headline in The Guardian reported that this treatment, deworming, had been...

This paper examines the relationship between physical activity and individual productivity among agricultural workers paid on a piece-rate basis. In the context studied, physical activity has a clear correspondence with worker effort. Agricultural workers' physical activity is directly observed...