Glimpsing the End of Economic History? Unconditional Convergence and the Missing Middle Income Trap

This paper suggests a reinterpretation of global growth—encompassing notions of unconditional convergence and the middle income trap—in the past 50 years through the lens of growth theory. We innovate by studying two modes of convergence: a classic “Solow” model where poorer countries catch up by growing faster on average; and a new “Wilde” model where catch-up growth is interpreted as growing faster than the frontier country, the United States. We apply these modes to both countries and people as units of analysis. We find that convergence has occurred faster and began earlier than widely believed.