At some point in the first half of the 19th century per capita GDP in the United Kingdom and the United States began to grow at something like one to two percent per year and have continued to do so up to the present. Now incomes in many economies routinely grow at 2 percent per year and some...

A model is proposed to describe the evolution of real GDPs in the world economy that is intended to apply to all open economies. The five parameters of the model are calibrated using the Sachs-Warner definition of openness and time-series and cross-section data on incomes and other variables...