Abstract
We extend the literature on the deep determinants of economic development by focusing on life expectancy, instead of income per capita, as an indicator of economic development, and by examining the role of informal, as well as formal, institutions. Our empirical results suggest that formal and informal institutions are substitutes. Improving informal institutions has positive effects on life expectancy that are statistically significant for most countries and stronger than the effects of improving formal
institutions. The gains from improving informal institutions are greatest for countries in which institutions are weakest. Geographical factors also help explain cross-country variation in life expectancy.