From 1990 to 2017, U.S. GDP per capita is up from $36,500 to $54,200, about 50%. France is up from $29,500 to $38,600, about 30%. The forecast for 2021 has France at $41,100 and the U.S. at $60,100: https://tradingeconomics.com/forecast/gdp-per-capita-ppp?con.... That means in 30 years, Americans will have gone from being modestly richer than the French (24%) to being quite a bit richer than the French (50%). To put that into perspective, the 50% gap from France to the U.S. is the same as the gap from Turkey to France.