This paper demonstrates a set of necessary conditions that should generate unbiased, internally consistent estimates of willingness to pay (WTP) from a double referendum mechanism. These conditions are also sufficient for demand revelation in an experimental laboratory environment. However, the...

Surveys used to elicit values for environmental public goods often employ variants of the referendum mechanism due to the cognitive simplicity and familiarity of respondents with the mechanism. One variant, the double referendum mechanism, requires respondents to state twice how they would vote...