Expanding Access to Clean Water for the Rural Poor: Experimental Evidence from Malawi
基于马拉维18个月的随机实验，研究发现为有幼儿家庭提供免费水处理溶液月度优惠券能大幅且持续改善水质和儿童健康，比社区健康工作者分发免费氯更有效且成本效益更高。
Data from an 18-month randomized trial show large and sustained impacts on water purification and child health of a program providing monthly coupons for free water treatment solution to households with young children. The program is more effective and much more cost effective than asking Community Health Workers (CHWs) to distribute free chlorine to households during routine monthly visits. This is because only 40 percent of households use free chlorine, targeting through CHWs is worse than self-targeting through coupon redemption, and water treatment promotion by CHWs does not increase chlorine use among beneficiaries of free chlorine.