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The article is about the estate tax, not an annual wealth tax, and loopholes to work around it ultimately taking advantage of lower tax rates on capital gains than on estates (not to mention wages) and deductions for "charitable" donation. You don't need new taxes on the wealthy to close these loopholes, you just need to eliminate them: charity is a nice thing you can do with your after-tax income, and all income should be taxed on the same progressive schedule.