In recent years, ethnic fractionalization has emerged as a central variable in quantitative analyses of outcomes ranging from economic growth rates (Easterly and Levine, 1997) and the quality of governance (La Porta et al, 1999) to ethnic conflict (Kay et al, 2000) and the frequency of coups d’etat (Londregan and Poole, 1990). Almost all such analyses employ, either alone or in combination with...