represents a serious attempt to provide a well-elaborated model for the construction of military price indexes, it deserves further attention. 121. As stated above, very few countries have developed price indexes with particular relevance to the military sector. Por practica1 reasons, one may, therefore, in the foreseeable future have to rely on price indexes of a more general nature. There are severa1 such indexes to consider. 122. Por instance, when calculating time series of military expenditures in consta& prices, both SIPRI and ILSS use the consumer price index of each country,': while ACDA instead has chosen to work with the gross national product (GNP) aeflator. According to the findings of SIPRI, the use of a general index such as a GNP deflator instead of a consumer price index does not make much difference 1 for its purposes, as the two series normally develop in a rather similar fashion. : A number of other surrogate price indexes taken from the civilian sector might also be adaptea for application to the military sector. ! . . . -53- 123. The difficulties of intertemporal comparisons apply not, only to single countries but affect comparisons among countries as well. As noted above, military priCe indexes WOldd be useful for extrapolatina purchasing pover parities or other conversion rates that may apply to a single point in time, B. Other aspects of military expenditure measurement, comparison and reduction 124. In addition to the development of satisfactory means for conversion s,mong currencies and adjustment for price change, a number of other issues of military expenditure measurement, comparison and limitation warrant serious attention from the ínternatíonal community upon the implementation of an international instrument for standardized reporting of military expenditures. These issues which have been touched upon by previous expert groups dealing with the reduction of military 
**Analysis**
The text appears to be discussing the measurement and comparison of military expenditures across countries, including the use of price indexes to adjust for inflation and conversion rates. This suggests that the topic is closely related to economic development and international trade, as it involves the comparison and analysis of economic data across different countries.

**Category**
Economic development, International trade