In identifying the free riders in the voluntary provision of a pure public good, Andreoni and McGuire (1993) simplify Bergstrom, Blume, and Varian's (1986)algorithm by systematizing the selection process of potential contributors. We propose an alternative algorithm in which a concept of...

There is no consistent notion of country size in the literature on the voluntary provision of an international public good. This paper suggests preference-adjusted GNP as a useful index of size. Defining a country s size in that manner, contributing countries are unambiguously larger than free...