vard University Press, 1997). " R. H. Sommerfeld, et al., "Gossip as an alternative for direct observation in games of indirect reciprocity." Proc. Nat Acad. Sci. 104:44, 17435-40 (2007). 14 Fung, A. & D. O'Rourke. 2000. Reinventing environmental regulation from the grassroots up: Explaining and expandi