Unambiguous Trends Combining Absolute and Relative Income Poverty: New Results and Global Application
证明在假设绝对贫困者比相对贫困者更穷的前提下，即使绝对与相对贫困趋势相反，总体贫困趋势有时也不受优先参数影响，并应用该测度评估1990-2015年全球贫困减半。
Abstract Over the period 1990–2015, many countries experienced a reduction in extreme absolute poverty and an increase in relative poverty. As a result, the global trend of “overall” income poverty, which combines absolute and relative poverty, may depend on arbitrary normative choices such as the priority given to the absolutely poor over the relatively poor. This article proves that, if one assumes that an individual who is absolutely poor is poorer than an individual who is only relatively poor, the overall poverty trend is sometimes independent of the priority parameter, even for cases for which absolute and relative poverty follow opposite trends. A survey conducted for this study suggests that this normative assumption collects broad support. This article applies overall poverty measures satisfying this assumption to assess the evolution of global poverty from 1990 to 2015. Results show that global overall poverty has been (at least) halved, regardless of the value chosen for the priority parameter.