This paper describes the characteristics of the Laspeyres and Paasche indices, as there are increasing requirements for the analysis of prices, quantities and basekt vectors. Both Laspeyres and Paasche are valuable choice for financial and economic analyses.

The paper starts from the premise: why the statistical agencies do not select the quantitative vector of reference q out of the Lowe formula as being the monthly quantitative vector q0 that belongs to the transactions of the month 0.