hvAidg MAATALOUDEN TALOUDELLINEN TUTKIMUSLAITOS 92•1999 Julkaisuja AGFIICULTURAL ECONOMICS RESEARCH INSTITUTE Finland Publications LANTBRUKS- EKONOMISKA FORSKNINGS- ANSTALTEN Publikationer Economic Value of Pro-Environmental Farming - A Critical and Decision-Making Oriented Application of the Contingent Valuation Method Jyrki J. Aakkula