Fascinant
The U.S. exhibits considerable inequality relative to other countries - it ranks last in the sample of countries in the first graph in the link below. But the data shown in the graph are for a point in time, a single year - the usual measure of inequality - and thus do not capture income mobility. If there are differences in mobility across countries, then perhaps looking at a longer timeframe that allows for mobility will change the picture. Lane Kenworthy, Markus Gangl, and Joakim Palme look at this issue and find that while longer timeframes are associated with lower Gini coefficients, looking at longer timeframes does not improve the position of the U.S. relative to other countries:
Is the U.S. a High-Inequality Country if Mobility Is Taken into Account?, Consider the Evidence
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