Volume 2. Preface. 12. Welfare theory and valuation (N. Bockstael, A. Myrick Freeman, III). 13. Environment, uncertainty, and option values (A. Fisher, K-G. Mäler). 14. Valuing the environment as a factor of production (N. Bockstael, K.E. McConnell). 15. Recreation demand models (V.K. Smith, D. Phaneuf). 16. Property value models (R. Palmquist). 17. Contingent valuation (R. Carson, M. Hanemann). 18. Cognitive processes in stated preference methods (B. Fischhoff). 19. Experimental methods and valuation (J. Shogren). 20. Quantifying and valuing environmental health risks (W.K. Viscusi, T. Gayer).