Some observations on the log-change index numbers and their connection with the factorial indexes

The paper makes a few comments on the characterizations of the log-change index numbers, and then builds up a link between the log-change indexes and the factorial indexes (Stuvel's indexes). It is also suggestedinter alia that log-change index numbers tend to ignore the effect of interaction between price and quantity (consumption) on the expenditure, in contrast to what is admitted by the factorial model.