The Economics of Sanitation Initiative (ESI) The Water and Sanitation Program (WSP) has launched a
multicountry Economics of Sanitation Initiative (ESI) to study the economic impacts of poor sanitation and the costs
and benefits of improved sanitation options. The overall goal of ESI is to provide decision makers at the country
and regional levels with the evidence they need to advocate for increased investment in improving sanitation and to
provide an improved evidence-base for efficient planning and implementation of sustainable sanitation and hygiene
options and programs.