The most charitable explanation you might be able to make for the US's lack of economic mobility is that the US has been an opportunity society for so long relative to other countries that a sorting has taken place whereby people with the most advantageous inheritable traits are already sitting near the top of the income distribution while others are already sitting near the bottom.
A slightly less charitable view is that economic barriers to upward movement are higher in the US than elsewhere (for instance, in the existence of high-cost/high-status/high-utility private tertiary education) and that the US simply has a higher dispersion of incomes, meaning that movement across the distribution requires greater absolute changes in income.
A slightly less charitable view is that economic barriers to upward movement are higher in the US than elsewhere (for instance, in the existence of high-cost/high-status/high-utility private tertiary education) and that the US simply has a higher dispersion of incomes, meaning that movement across the distribution requires greater absolute changes in income.
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