This paper analyzes which of various plausible determinants are significantly related to an index of "perceived corruption" compiled from business risk surveys for the mid-1990s. Using 2SLS to reduce problems of endogeneity and a variation of Leamer's "extreme bounds analysis" to test for robustness, it finds three factors robustly significant. Countries that were more economically developed and those which are former British colonies were rated "less corrupt". Those which have a federal structure were "more corrupt". Daniel Treisman Assistant Professor Department of Political Science University of California, Los Angeles 4289 Bunche Hall LA CA 90095-1472 Treisman@polisci.ucla.edu First Draft September 1997 Revised April 1998 ####