Economic theory suggests that willingness to pay for two goods independently offered should remain unchanged when the survey instrument changes slightly. Four survey treatments consisting of comprehensive good and a subset of that good were used. The surveys alternated in the question ordering...

The travel cost model is frequently used to estimate net willingness to pay for recreation at remote sites by using the visitor's travel costs as a proxy for the price of recreation. However, some concern has been raised over the validity of using the visitor's stated travel costs as a proxy for...