By James Kwak
In the Times a couple of days ago, Gregory Mankiw made a half-hearted case for eliminating the estate tax that was so weak I’m not even sure he convinced himself. The core of his argument is that the estate tax violates the principle of horizontal equity, according to which “similar people should face similar burdens.” The problem, on his view, is that between two rich couples that each amass $20 million, the Profligates who consume their wealth before death end up paying lower taxes than the Frugals who maintain a modest lifestyle. “To me, this does not seem right,” Mankiw concludes.
First of all, it’s not even clear why this example violates horizontal equity. The Profligates and the Frugals are not “similar people”—Mankiw specifically constructed the example that way. They may have each earned the same amount of money, but they have vastly different consumption habits.
Second, it’s not clear that the Frugals are paying more tax than the Profligates. Their estate will pay higher taxes, but by then they are dead; the estate tax does not directly limit their personal consumption in the slightest. In fact, the ones whose estate will pay the tax are the ones who apparently are not interested in consumption in the first place. Now, the defense of Mankiw is that the Frugals do care about how much money they can pass on to their children, so the estate tax does affect their utility. But that brings up the third, and most important point . . .