The paper attempts to explain why single factor explanations of the poverty of nations are usually found to be unsatisfactory. Middle- and low-income countries excluding sub-Saharan Africa, for instance, have an income per head which stands at about one third of the rich countries’ income per...

This paper presents a new data set on human capital. It is based upon data released at the OECD for a subgroup of 38 member and non-member countries, and an effort performed at the Development Centre to expand this data set to other developing countries. The key to our methodology is to minimise...

This paper studies the puzzling lack of correlation between income and schooling in macro regressions. It is argued that the root of the puzzle is threefold. First, there is a problem of a proper definition of the way in which years of schooling should enter into a production function. Second,...