I actually think the biggest reason income inequality has changed so much is due to technology. A waitress today serves the same amount of tables as before. A banker can evaluate many more loans because they can pull credit, etc on computers. A lawyer can do way more work because they can electronically access documents instead of getting them from a library. An engineer can do way more with CAD/other software than doing calculations by hand.
Since pay always follows productivity, those who use technology have seen their incomes increase.
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