An experiment they ran in Tangiers showed that households were willing to pay a substantial amount of money to have a private tap in their home. Once they had a tap, there was no reduction in water borne illness. But there was a substantial increase in self-reported well-being as families had more time for leisure, and the tensions that arose between households as they jostled in line at the public tap disappeared.
The Wall Street Journal
April 23, 2011