摘要：We collect contingent valuation data from 524 student survey respondents over a 3‐day, 72‐hour period. Data analysis of a hypothetical campus referendum focuses on time‐of‐day effects on willingness to pay for a renewable energy project. We find that subjects responding to the survey during the night‐time hours (i.e., between 12 a.m. and 6 a.m.) do not display the law of demand, offering theoretically invalid responses to questions with important policy implications. Results from this research may have serious implications for the contingent valuation method (CVM). In short, just like your father said, nothing good happens after midnight when using the CVM. (JEL Q51)
