농경지 양분수지의 개선 가치 분석:진술선호법과 대체비용법의 비교

Abstract

This study estimated the public value of agricultural nutrient balance improvement using the Replacement Cost Method (RCM) and comparatively analyzed it with the pre-existing stated preference method results to explore strategies for complementary utilization of the two valuation approaches. The public value of nutrient balance improvement through the statement preference method was estimated based on the total economic value derived from the public’s willingness to pay for the environmental quality improvement effect—the ultimate outcome of nutrient balance improvement (Outcome Indicator). The RCM quantified the avoided costs (output indicators) required to clean up the reduced pollutant runoff from the recommended and standard fertilization methods using the DNDC model, thereby measuring the minimum technical value as a public value. Key research findings showed that the public benefit value estimated using the stated preference method (KRW 253.68 billion per year) was higher than the public benefit value (KRW 208.856 billion per year) derived using the replacement cost method (based on recommended fertilization and purification costs). Furthermore, the total public benefit value of the recommended fertilization method (KRW 208.856 billion based on purification costs) was approximately 1.25 times higher than that of the standard fertilization method (KRW 167.313 billion). These results suggest that the two valuation methods should be utilized complementarily. Stated preference-based values ​​serve as benchmarks for establishing social legitimacy and long-term policy objectives. RCM values ​​are ideal for demonstrating technical efficiency and supporting early environmental investments. This quantitative approach provides a basis for prioritizing incentives for activities to improve nutrient balance in agricultural lands, enabling the design of differentiated incentives based on factors such as areas with high potential for reducing runoff from agricultural land and precision fertilization methods.