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So,
the share of total income for fifty years has decreased for the lower four quintiles and increased for the top quintile. The wealthy have been skimming off more and more, while the maximum income limit remains and has crept up only slowly. It's no wonder that Social Security needs adjusting. But what needs adjusting is the cap on contributions.
https://www.statista.com/statistics/203247/shares-of-household-income-of-quintiles-in-the-us/