Radial and non-radial decompositions of profit change: an application *
Radial and non-radial decompositions of profit change: an application *
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发表时间：
2007-02
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通讯作者：
Biresh K. Sahoo;K. Tone
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作者：
Biresh K. Sahoo;K. Tone
Grifell-Tatje和Lovell(1999)通过将扩展的径向DEA框架中的利润变化分解为六个相互排斥的分量，对文献做出了贡献。他们的方法似乎存在两个缺陷。首先，当存在松弛时，径向模型不能实现完全效率，因此，这些组件中的每个组件的贡献都被严重低估。其次，使用基期价格作为权重对这些组成部分进行评估，可能具有潜在的误导性。为了规避这些缺点，我们首先引入了非径向DEA模型，其次，提供了强有力的理论论证，支持将本期价格/两个时期的平均价格作为权重，用来评估这些组成部分的贡献。本文以印度银行业为例，分析了利润变化的径向分解和非径向分解，从而实证检验了竞争对利润变化的作用及其六个互斥成分。我们的广泛经验结果如下：首先，径向和非径向模型在各个分量的贡献上产生了直径相反的符号。其次，2002年后，所有所有制集团的效率变化趋势日益增强，表明了改革进程对印度银行业业绩影响的肯定姿态。第三，尽管国有化银行是历史最悠久的银行，但它们的产出和资源配置行为并没有反映出它们的学习经验。
Grifell-Tatje and Lovell (1999) made a contribution to the literature by decomposing profit change in extended radial DEA framework into six mutually exclusive components. Their approach appears to suffer from two shortcomings. First, radial models do not achieve full efficiency when slacks are present, and therefore, the contributions of each of these components are grossly underestimated. Second, evaluations of these components, using base-period prices as weights, can be potentially misleading. To circumvent over these shortcomings, we, first, introduce non-radial DEA models, and second, provide strong theoretical argument in favor of either current-period prices/average price of both periods as weights to be used to value the contributions of each of these components. The Indian banking sector is taken as a case study to illustrate the radial and non-radial decompositions of profit change so as to empirically examine the role of competition on profit change as well as its six mutually exclusive components. Our broad empirical results are as follows: First, radial and non-radial models yield diametrical opposite sign on the contributions of various components. Second, the increasing efficiency change trend in all ownership groups after 2002 indicates an affirmative gesture about the effect of the reform process on the performance of the Indian banking sector. Third, despite the fact that nationalized banks are the oldest banks, they do not reflect their learning experience in their output-and resource allocation behaviors.