Economists Wojciech Kopczuk of Columbia University and Joel Slemrod of the University of Michigan studied how mortality rates in the United States were changed by falling or rising estate taxes. They note that while the evidence of "death elasticity" is "not overwhelming," every $10,000 in available tax savings increases the chance of dying in the low-tax period by 1.6 percent. This is true both when taxes are falling, so that people are surviving longer to achieve the tax savings, and when they are rising, so that people are dying earlier, according to Kopczuk and Slemrod.
"Death elasticity" does not necessarily mean that greedy relatives are pulling the plug on the dying or forcing the sickly to extend their lives into a lower taxed period. According to a 2008 paper from University of Pittsburgh Medical Center Doctor G. Stuart Mendenhall, while tax increases give potential heirs large economic incentives to limit care that would prolong life, distressed patients may "voluntarily trade prolongation of their life past the end [a low tax period] for large ﬁnancial implications for their kin.