The Importance of Sample Discrimination in Using the Travel Cost Method to Estimate the Benefits of Improved Water Quality
研究在佛蒙特州圣奥尔本斯湾应用旅行成本法，通过调查当前和过去的使用者，发现多数受访者会在水质改善后返回，强调了样本区分对估算效益的重要性。
An application of the travel cost method, with emphasis on surveying current users and former users, was made at St. Albans Bay (Lake Champlain) in Vermont. Over the past 10-15 years phosphorus loading in the bay, causing increased rooted and floating plant growth, resulted in declining recreational use. A survey of 311 respondents, who had former recreational experience with St. Albans Bay, revealed that most would return there if the water were to become clean.