  This paper discusses region wealth size distributions, through their member
cities aggregated tax income. As an illustration, the official data of the
Italian Ministry of Economics and Finance has been considered, for all Italian
municipalities, over the period 2007-2011. Yearly data of the aggregated tax
income is transformed into a few indicators: the Gini, Theil, and
Herfindahl-Hirschman indices. On one hand, the relative interest of each index
is discussed. On the other hand, numerical results confirm that Italy is
divided into very different regional realities, a few which are specifically
outlined. This shows the interest of transforming data in an adequate manner
and of comparing such indices.
