The Role of the Unit of Analysis in Tax Policy Reform Evaluations
Melbourne Institute Working Paper No. 28/03
Date: December 2003
This paper examines the implications, for overall social welfare and inequality comparisons, of using different definitions of the unit of analysis - the income recipient - in computing summary measures. Comparisons are made using the Melbourne Institute Tax and Transfer Simulator (MITTS), a simulation model of the Australian direct tax and benefit system, of the effects of flattening the marginal tax rate structure. The reform was found to reduce inequality in all cases. However, it was not always judged to improve social welfare, depending on the degree of inequality aversion and the type of income unit chosen.