The past half-century has witnessed a dramatic change in the way in which people live. Fifty years ago, only a small proportion of the less developed world lived in cities, and world poverty was overwhelmingly rural. In 1950, less than one-fifth of the population of the “third world” was...

"The migration of labor from rural to urban areas is an important part of the urbanization process in developing countries. Even though it has been the focus of abundant research over the past five decades, some key policy questions have not found clear answers yet. To what extent is internal...