Everyone knows what political corruption is, but it is notoriously hard to define. Different cultures have different conceptions of corruption: what would be considered corrupt in Denmark might be seen as simply polite in Indonesia. This understanding also varies across time: buying office was standard procedure in eighteenth-century Britain but would be inexcusable today. Arnold Heidenheimer has divided corruption into three categories (Heidenheimer et al. 1978). "White" corruption includes acts that a majority of people would not consider worthy of punishment. "Gray" corruption includes acts that "some elements" would want to see punished, but others would not. "Black" corruption includes acts that a "majority consensus . . . would condemn and would want to see punished on the grounds of principle." Heidenheimer suggests that as societies modernize, behavior that was once seen as "white" becomes "gray," and may eventually turn "black." Others have suggested that the...