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Notes

 The Wholesale Price Index, currently the Corporate Goods Price Index, compiled by the Bank of Japan covers every year since January 1887. Reflecting changing economic conditions, the Index has undergone several revisions in base period, coverage, calculation formulas, and other aspects.

Tokyo Wholesale Price Index on January 1887 Base
 In response to the price hikes resulting from the Sino-Japanese War (1894-1895), the Kahei seido chosakai (Committee on the Monetary System) in 1895 created Japan's first price index; that same year the Ministry of Agriculture and Commerce released its Price Index of Important Commodities, and other institutions followed in creating their own price indexes. As a part of this trend, the Bank of Japan created the Tokyo Wholesale Price Index on January 1887 Base and began releasing it in 1897. At the beginning, it used Ministry of Agriculture and Commerce data as well in its price samples. Covering 30 commodity items (gradually rising to 40 over the period from mid-1887 to 1898), the Tokyo Wholesale Price Index on January 1887 Base is comprised of individual commodity indexes and a simple arithmetic average index of all commodities.
 The data source is Hundred-year Statistics for Wholesale Price Indexes in Japan, issued by the Research and Statistics Department at the Bank of Japan.

Tokyo Wholesale Price Index on October 1900 Base
 In October 1900, the Bank of Japan began to tabulate a Price Index of Important Commodities in Major Cities - a new index covering eight major cities: Tokyo, Osaka, Kyoto, Moji, Nagoya, Hakodate, Otaru, and Fukushima. Published for the first time in July 1902, this Index from 1913 excluded figures for Tokyo, tabulating these figures in a separate Tokyo Wholesale Price Index with a base of October 1900. Covering 56 commodity items, the Tokyo Wholesale Price Index was comprised of individual commodity indexes and a simple arithmetic average index of all commodities.
 The data source is Hundred-year Statistics for Wholesale Price Indexes in Japan, issued by the Research and Statistics Department at the Bank of Japan.

Tokyo Wholesale Price Index on 1933 Base
  The Tokyo Wholesale Price Index with a base of October 1900 continued to be compiled even after World War I. However, subsequent industrial developments had already necessitated revisions in the commodity items covered due to changes in categories of traded commodities, including the introduction of rayon and various other new products. At the same time, rapid progress had occurred in research into the theory of index numbers. Given these developments, the Bank of Japan compiled an index with a base of 1933, publicly introducing this system in December 1936. Under the new system, the number of selected commodity items nearly doubled to 110, while ten indexes were compiled by commodity group, in addition to individual commodity indexes and an all-commodity index. A new weighted arithmetic average method based on fixed weights as of the base year - the Laspeyres Index - replaced the previously-used simple arithmetic average method.
 The data source is Hundred-year Statistics for Wholesale Price Indexes in Japan, issued by the Research and Statistics Department at the Bank of Japan.