Bom artigo do Cláudio Shikida, Ari Francisco e Pedro Sant'Anna no Cato Journal:
"There are many studies on the relationship between economic development and institutions. Institutions can be classified as formal or informal. This article emphasizes the importance of the relationship between culture (informal institutions) and the quality of public goods supplied by the government, using a measure of state failure: the Failed States Index. The results suggest that culture is more important than formal institutions in explaining differences in the degree to which states fail."