The objective of this paper is to present an inequality decomposition method, the two-stage nested Theil decomposition method, which is an extension of the ordinary one-stage Theil decomposition method. The method is analogous to a two-stage nested design in the analysis of variance (ANOVA). It considers the three-level hierarchical structure of a country: region-province-district, and decomposes overall regional inequality, as measured by Theil indices based on district-level mean incomes, into three components: the between-region, between-province, and within-province inequality components. The within-province component is a weighted-average of within-province income inequalities for each province, while the between-province component is a weighted-average of between-province income inequalities within each region. The method uses a district as the underlying regional unit to measure regional income inequality, rather than a province, and thus can analyze the contribution of within-province inequalities as well as between-province and between-region inequalities to the overall regional income inequality in a coherent framework. This paper applies the two-stage nested Theil decomposition method to district-level income and population data in China and Indonesia and explores factors determining regional income inequality in China and Indonesia. Copyright Springer-Verlag Berlin Heidelberg 2003JEL classification: O15, C8,

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This paper estimates regional income inequality from 1993 to 1998, using a Theil index based upon district-level GDP and population data. Between 1993 and 1997, when Indonesia's annual average growth rate exceeded 7%, regional income inequality rose significantly. A two-stage nested inequality decomposition analysis indicates this was due mainly to an increase in within-province inequality, especially in Riau, Jakarta and West and East Java. In 1997, the within-province component represented about 50% of regional income inequality. The crisis caused per capita GDP growth to revert to its 1995 level, but the impact was spread unevenly across provinces and districts. In 1998 regional income inequality declined to its 1993-94 level. In contrast to 1993-97, three-quarters of the 1998 decline was due to a change in between-province inequality, with the Java-Bali region playing a prominent role. The crisis appears particularly to have afflicted urban Java and urban Sumatra.

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This paper analyzes the changes in determinants of inter-provincial income inequality in Indonesia from 1983 to 2004 associated with structural changes using the bi-dimensional decomposition method of a population-weighted coefficient of variation. The method unifies two inequality decompositions by regional groups and GRP components (industrial sectors) and thus enables us to assess the contributions of GRP components to within-region and between-region inequalities, as well as to overall inequality. As the share of mining has decreased, the spatial distribution of manufacturing has played a more important role in the inequality of Sumatra and Kalimantan, while the primacy of Jakarta, with strong urbanization economies, facilitated by globalization and trade and financial liberalization, has determined much of Java-Bali's inequality and, therefore, overall inequality in Indonesia.