This paper provides a profile of regional income inequality using a distributional criterion whereby a state's share of total income equals its share of total population. The results for 1929 to 1990 show that inequality persisted among regions with a substantial declining trend up to 1979 and a slight rise thereafter. On the other hand, equality among states within their regions is found to have been the condition since 1929.
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Nissan et al. (1993) studied this question.
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