According to this source, this source, and this source, actual post-tax disposable income for many families in Minnesota flattens between income of about $20,000 and $50,000, and in many cases a "raise" from one's employer actually results in less disposable income for the worker. I personally know people who have been told by employees NOT to give them a raise, because it would hurt them financially.
If you want to kill someone's incentive to go to college to get from $20k/year to $40k/year annual income, this would be a great way to do it.
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