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Income Mobility, Ineqality and Social Welfare

  • Creedy, J.

It is often argued that an observation of rising annual income inequality need not have negative normative implications. The argument is that if there has been a sufficiently large simultaneous increase in mobility, the inequality of income measured over a longer time period can be lower despite the rise in annual inequality. In this paper, it is shown by example that if normative implications are drawn from a standard social welfare function, the set of circumstances put forward in the above argument are not sufficient to guarantee that social welfare will improve. The reason is that even though rising mobility does reduce longer term inequality, it also increases the variability of income profiles over time and the latter has a detrimental social welfare effect. Hence, there are two types of mobility: one which reduces inequality (regression to the mean), but another that increases inequality (relative movements uncorrelated with incomes). Further, if individuals' aversion to income variability is sufficiently larger than the social welfare judge's aversion to inequality, then an increase in mobility, no matter how large, cannot offset the negative normative effect of rising annual inequality. Copyright 2002 by Blackwell Publishers Ltd/University of Adelaide and Flinders University of South Australia

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Paper provided by The University of Melbourne in its series Department of Economics - Working Papers Series with number 479.

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Length: 21 pages
Date of creation: 1995
Date of revision:
Handle: RePEc:mlb:wpaper:479
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