Willig,R.D. 1976. Consumer surplus without apology.American Economic Review, 66 :
589 97.
Zeckhauser,R. 1974. Procedures for valuing lives.Public Policy, 23 :419 64.
and Schaefer,E. 1968. Public policy and normative economic theory. Pp.27 101inThe
Study of Policy Formation, ed. R. Bauer and K. J. Gergen. Glencoe, Ill.: Free Press.
economic techniques 745