The average share price of Nikkei Stock Average, formerly known as Zheng Dong's revised average share price, is compiled and published by Japan Economic News Agency to reflect the price changes of Japanese stock market. The index has been calculated and compiled since September 7th, 1950. The sample stocks are the stocks of 225 companies listed on the Tokyo Stock Exchange. The base period is the same day, and the average share price of that day is 176.2 yen, which was called "Zhengdong revised average share price" at that time. On may 1975 and may 1 day, the nihon keizai shimbun bought a trademark from Dow Jones, and calculated it with the correction method of Dow Jones. The stock index was renamed "Nikkei Jones Average Share Price". 1 985 may1day, when the contract expires 10 year, the name was changed to "Nikkei average share price" through negotiation between the two companies.

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