The purpose of the indicator is to measure the movements of the basic prices of products produced in industry at the first stage of sale. PPI at every aggregation level equals the weighted average of the two sub-indices. TE OR'92 conforms with ISIC Rev. 3, and NACE Rev. 1 at 2-digit level. From January 1999 the new TE OR'98 was introduced, which fully conforms to NACE Rev.1.
Prices refer to all sales of the selected representative products in the observed month.
Random sampling is not used. The data suppliers are enterprises. Aggregated indices are Laspeyres-type chain indices e.g. weighted arithmetic averages of the commodity chain indices. Nature of Basic Data. Being a chain index, the yearly-reweighted indices are linked together without any adjustment.