1 research and statistics department for release 2 00 p m monda y december 9 2002 revision of the wholesale price index switchover to 2000 base corporate goods cgpi purpose bank japan has revised 1995 wpi into this is intended improve precision by incorporating structural changes in ese economy over past five years especially radical surrounding prices such as diversification commodities their it also aimed at reducing burden on correspondent companies who cooperate with surve thus become most aggressive 20 improvement statistical first selection been reviewed eg expansion newly selected second year both weight calculation updated from aims these are incorporate since previous