Tax efficiency is more appropriately measured once we have®ltered out the elects of the activity variables. Moreover, the tax efficiency analysis carried out using the extant approach does not allow for a comparison of tax efficiency across states and across time.
We, therefore, move to a completely novel approach, which considerably generalizes and improves upon the extant approach to tax efficiency and, at the same time, points to the shortcomings of the extant approach.
We discover, for instance, that the higher the proportion of central grants in the total expenditure of states, the lower is their efficiency in tax collection.
Also it appears that, ceteris paribus, the less poor states are less in efficient in tax collection.