A better understanding of a county’s political and social processes and entities that determine the extent and nature of investments in sanitation could catalyze a sharp increase in numbers of people with access, especially for the poor, according to a new report released by the Water and Sanitation Program. Based on an analysis of experiences in Brazil, India, Indonesia, and Senegal, The Political Economy of Sanitation, proposes an approach to address the political economy of sanitation in a given country in order to more effectively advocate with policy makers to invest more and to better target services for poor people.