Martini Indices, Fisher Indices, and Consistency-in-Aggregation

In this article we consider the price and quantity indices introduced in the nineties by the Italian statistician Marco Martini (1944–2002). It turns out that Fisher indices can be considered as members of the infinite set of Martini indices. In particular attention is paid to the question to what extent these indices exhibit Consistency-in-Aggregation. This throws new light on the behavior of Fisher indices.