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This paper outlines a new framework for gauging the properties of quasi-experimental estimates of the Willingness To Pay (WTP) for changes in environmental and other non-market amenities. As a rule, quasi-experimental methods cannot offer alternative hypotheses to judge the quality of their quasi random assignments of treatment and control outcomes to economic agents. Their results must be judged by the explanation of the event used to construct the assignment and the counter examples offered as robustness checks for the logic of each application.
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