本文針對吳珮瑛與葉淑琦(1997)文中對環境財貨改善效益評估模式欠缺考量之 處，提出說明。我們分別從界定環境財貨在效用與支出函數中所扮演的角色、評估多種環 境品質改善的效益衡量模式、福利衡量公式、採用轉換與比例方式引進環境財貨於估計模 式中與建構環境財貨需求體系等問題上，所隱含的模型意義與使用上的限制，分別提出修 正意見。釐清這些問題，始能對多種環境品質改善之理論與實證結果進行相關印證。

　　　　　We build up this comment on the Wu and _Yeh(1997) paper published in this journal. We identify several theoretical as well as modeling problems in that paper regarding the welfare measurements of multipart environmental quality improvement. Ignoring the characteristics of non- marketed environmental goods and involving the traditional welfare approach would bias the benefit estimate in valuing the changes of environmental goods. The original empirical results cannot be used to confirm the theoretical expectation about the measures from the sequential and holistic evaluation.