Income inequality and conflicts: A Gini decomposition analysis

IF 1.1 Q3 ECONOMICS Economics of Peace and Security Journal Pub Date : 2020-10-19 DOI:10.15355/epsj.15.2.66
I. Sarntisart
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引用次数: 1

Abstract

There has been little research examining how income inequality may or may not contribute to the “grievance” aspect of conflict. For the most part, the measure used is the traditional Gini index, which is suitable to reflect vertical inequality (VI) rather than horizontal inequality (HI). Calculating HI requires the ability to decompose inequality indices, especially the Gini index, into a within-subgroup component and a between-subgroup component. There exists a long-standing stream of literature discussing how to decompose the Gini index. This article discusses the shortcomings of existing Gini decomposition methods and proposes a novel method that divides the Gini index into within-subgroup and across-subgroup components. This novel method is then applied to the case of Thailand in the years 2009–2017. The differences in the two components derived from the method of this article and those of existing methods are large. In addition, the HI measure this article introduces is also large relative to non-Gini measures such as the Theil and Shorrocks indices. Therefore conflict-related papers that include an existing Gini decomposition and HI measure among their independent variables may wish to test their models with those of this article and other measures—to examine if the results are consistent and to mitigate a risk of misleading policymakers.
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收入不平等与冲突:一个基尼系数分解分析
关于收入不平等可能或可能不会导致冲突的“不满”方面的研究很少。在大多数情况下,使用的是传统的基尼指数,它更适合反映垂直不平等(VI),而不是水平不平等(HI)。计算HI需要将不平等指数,特别是基尼系数分解为子组内成分和子组间成分的能力。长期以来,有大量文献讨论如何分解基尼系数。本文讨论了现有基尼系数分解方法的不足,提出了一种将基尼系数划分为子组内和子组间两部分的新方法。然后将这种新方法应用于2009-2017年的泰国案例。本文方法导出的两个分量与现有方法差异较大。此外,本文引入的HI指标相对于非基尼系数指标(如Theil和Shorrocks指数)也很大。因此,在独立变量中包含现有基尼系数分解和HI测量的冲突相关论文可能希望用本文和其他测量来测试他们的模型,以检查结果是否一致,并减轻误导政策制定者的风险。
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