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The decomposition of the redistributive effect into vertical effect, horizontal effect and reranking: the state of the art and the application to the Italian case

  • Pellegrino Simone
  • Vernizzi Achille

Recently van De Van, Creedy and Lambert (2001) and Urban and Lambert (2008) have reconsidered the original Aronson, Johnson and Lambert (1994) decomposition of the redistributive effect in order to identify the optimal bandwidth that should be used in decomposing the redistributive effect, when groups with close pre-tax incomes are considered. The methodology proposed by van De Van, Creedy and Lambert (2001) suggests choosing as the optimal bandwidth the one which maximizes the ratio between the potential effect V (which depends on the bandwidth) and the actual redistributive effect RE (which is invariant). Urban and Lambert (2008) discuss a set of further possible decompositions of the redistributive effect together with a decomposition of the Atkinson-Plotnick-Kakwani index into three terms. Making use of a microsimulation model based on microdata provided by the Bank of Italy in its Survey on Households Income and Wealth in the year 2006, in this paper we investigate the three most important decompositions of the redistributive effect applied to the 2006 and 2007 Italian personal income tax. Moreover, we throw some more light on the behavior of these decompositions in order to look for criteria to choose a bandwidth which allows the three different definitions of potential redistributive effect to assume values which can be as coherent as possible, and, in the meanwhile, to catch as much as possible of the potential vertical effect. We suggest looking for the bandwidth where the ratio between the maximum distance among the different potential vertical effect definitions and the minimum among the different potential vertical effects is minimum.

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Article provided by Società editrice il Mulino in its journal Politica economica - Journal of Economic Policy (PEJEP).

Volume (Year): (2011)
Issue (Month): 1 ()
Pages: 25-48

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Handle: RePEc:mul:je8794:doi:10.1429/34352:y:2011:i:1:p:25-48
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