New research reported by the Deutsche Bank Research (DB) shows that, on average, there is a positive (albeit non-linear) relationship between the per capita income and the share of middle class in total population:
There is an exception, however, although DB's data does not test formally for it being an outlier, and that exception is the U.S. Note, ignore daft comparative reported in chart, referencing 'levels' in the U.S. compared to Russia, Turkey and China: all three countries are much closer to the regression line than the U.S., which makes them 'normal,' once the