7. See Moore, Mark H., Policies to Achieve Discrimination in the Effective Price of Heroin, American Economic Review 63, No. 2, May, 1973; Spence, A. Michael, A Note on the Effects of Pressure in the Heroin Market, Cambridge: Harvard Institute of Economic Research, Discussion Paper 588, November, 1977; Reuter, Peter, and Mark Kleiman, Risks and Prices: An Economic Analysis of the Drug Markets, in Tonry, Michael, and Norval Morris (eds.) Crime and Justice: An Annual Review of Research, 1986 edition (Chicago: University of Chicago Press). 8. Moore, Mark H., and Dean R. Gerstein, (eds.) Alcohol and Public Policy: Beyond the Shadow of Prohibition, (Washington, DC: National Academy Press) 1981. 9. See Mill, On Liberty, Ch. 5, par. 10, p. 170.