Estimating of indirect benefit for the sewage line business using contingent valuation method

It can be said that the Sewage Line Repair Business being actively executed for recent several years for the purpose of preventing flooding and bad smell and improving water quality of a discharge water zone due to stagnation of the sewage line is typical environmental goods. The value of this environmental goods is being measured by indirect benefit because it has a property that wasn't dealt in the market. In order to measure the indirect benefit, the Contingent Valuation Method (CVM) is being much used. The CVM is a technique that evaluates environment-economic benefit of facilities by converting an environmental value into economic benefit, so the reliability in the economic benefit estimated by utilization of CVM used to become a problem due to Bias occurred in the question design process and response process. In order to solve this reliability issue, this study performs question design and verified its result analysis and estimated benefit by reflecting the Answer Mechanism of respondents.