IMPACT OF TAXES AND TRANSFERS
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Enami, Lustig, Aranda, No. 25, November 2016<br />
The element on the right-hand side shows the change in the Gini coefficient (from pre-fiscal<br />
to post-fiscal income) when all taxes and transfers other than tax T k are in place. Without loss<br />
of generality and for simplicity, we will set k = 1. Using equation 13, we have<br />
∑ n<br />
RS m<br />
RS<br />
i=1 (1−g i )П Ti +∑ j=1(1+b j )ρ Bj<br />
1−∑n<br />
i=1 g i +∑m<br />
> ∑ n (1−g i )П RS m<br />
RS<br />
i=2 T +∑ i j=1(1+b j )ρ Bj<br />
j=1 b j<br />
1−∑n<br />
i=2 g i +∑m<br />
j=1 b j<br />
.<br />
The analysis goes similarly. After some rearranging, we have<br />
(40) П RS T1 > ( −g 1<br />
) ( ∑<br />
1−g 1<br />
or equivalently,<br />
n (1−g i )П RS m<br />
RS<br />
i=2 T +∑ (1+b i j=1 j )ρ Bj<br />
1−∑n<br />
i=2 g i +∑m<br />
j=1 b j<br />
)<br />
(40b)<br />
K > − ( ∑ g iП Ti<br />
П T1<br />
n K m K<br />
i=2 +∑j=1<br />
b j ρ Bj<br />
1−∑n<br />
i=2 g i +∑m<br />
j=1 b j<br />
).<br />
Therefore, for T 1 to be equalizing when (n − 1) taxes and m benefits are already in place, the<br />
following conditions apply.<br />
Condition 41:<br />
If and only if П RS T1 > ( −g 1<br />
) ( ∑<br />
1−g 1<br />
− ( ∑<br />
n<br />
g K m K<br />
i=2 iП Ti +∑j=1<br />
b j ρ Bj<br />
1−∑n<br />
i=2 g i +∑m<br />
j=1 b j<br />
n (1−g i )П RS m<br />
RS<br />
i=2 T +∑ (1+b i j=1 j )ρ Bj<br />
1−∑n<br />
i=2 g i +∑m<br />
j=1 b j<br />
)), then adding T 1 reduces the inequality.<br />
) (or П T1<br />
K ><br />
Condition 42:<br />
39