Background:Background: The credibility of contingent valuation studies has been questioned because of the potential occurrence of scope insensitivity, i.e. that respondents do not react to higher quantities or qualities of a good. Abstract: Objective:Objective: The aim of this study was to...

Childhood immunisation is one of the most cost-effective public health interventions, yet its population coverage in low- and middle-income countries is severely limited by the fiscal constraints that health services face. A recent proposal suggested that commitments to purchase vaccines and...

'Protest zeros' occur when respondents reject some aspect of the contingent valuation (CV) market scenario by reporting a zero value even though they place a positive value on the amenity being valued. This is inevitable even in the best-designed CV study, and, when excluded on an ad hoc basis,...