Replaced with revised version of paper 07/14/11.

Another version will replace the current draft

A survey with validation question was delivered to 3475 respondents to study the impact of using validation question to improve data quality. Results show that The respondents who passed the validation question had significantly older ages, higher median incomes and higher education levels. The...

This article examines the preferences revealed by three non-hypothetical experiments. We found that WTP estimates from the choice experiment are the highest, followed by that of contingent valuation methods, and then experimental auctions. Our results also suggest that the discrepancies among...