Economists have reported econometric results that rely on estimates of the population of every country in the world for the past two thousand or more years. The underlying source is usually McEvedy and Jones’ Atlas of World Population History, published in 1978. The McEvedy and Jones data have...

The historical fertility transition is the process by which much of Europe and North America went from high to low fertility in the nineteenth and early twentieth centuries. This transformation is central to recent accounts of long-run economic growth. Prior to the transition, women bore as many...