Urban areas tend to have much more productive labor and higher salaries than rural areas, and there are vast differences across urban areas. Areas with high salaries and high productivity tend to have employers that invest in much more research and development than areas with low salaries and...

Over the next generation, Sub-Saharan Africa faces three big, inter-related challenges. Its population will double to 2 billion by 2045. By then, more than half of Africans will be living in cities. And this group of mostly young people will be connected with each other and the world through...