The controversy over how much to charge for health products in the developing world rests, in part, on whether higher prices can increase use, either by targeting distribution to high-use households (a screening effect), or by stimulating use psychologically through a sunk-cost effect. We develop a methodology for separating these two effects. We implement the methodology in a field experiment in Zambia using door-to-door marketing of a home water purification solution. We find evidence of economically important screening effects. By contrast, we find no consistent evidence of sunk-cost effects.

We use the Becker-DeGroot-Marschak (BDM) mechanism to estimate willingness to pay (WTP) for and heterogeneous impacts of clean water technology through a field experiment in Ghana. Although WTP is low relative to cost, demand is inelastic at low prices. Short-run treatment effects are positive throughout the WTP distribution. After 1 year, use and benefits are both increasing in WTP, with negative effects on low-WTP households. Combining estimated treatment effects with households’ WTP implies valuations of health benefits much smaller than typically used by policy makers. We explore differences between BDM and take-it-or-leave-it valuations and make recommendations for implementing BDM in the field.

We assess the rate of replication for empirical papers in the 2010 American Economic Review. Across 70 empirical papers, we find that 29 percent have 1 or more citation that partially replicates the original result. While only a minority of papers has a published replication, a majority (60 percent) have either a replication, robustness test, or an extension. Surveying authors within the literature, we find substantial uncertainty over the number of extant replications.