The real fuel of the economy is money being spent on Apple products, walmart, amazon, --hell even yachts/airplanes (somebody has to build those)..
To fight income inequality, I think we need to tax at the point of investment.. --if you buy anything you're taxed on it..this includes investments/stocks/bonds/etc... just flat consumption taxes... give a UBI to offset the poorer folks...
But have a mandatory flat tax...do away w/ the IRS/income tax. If you're not a U.S. citizen and not getting UBI sorry--but you're sales tax will not be subsidized by UBI--and if you're here illegally/unpapered -- you're now a tax payer congrats we can stop trying to deport everyone since now we make more tax money off of them!