Nikkei newspaper estimated the 2013 market share of supermarket in Japan. According to it, Aeon was the biggest chain followed by Ito-yokado, Uny, Daiei and Life. The total sales of supermarkets were 19 trillion yen. The sales increased by 2.3% in comparison to 2012.
I use Life every weekday.
|Supermarket||Market share (%)|
The source of the market share is Nikkei Sangyo Shimbun newspaper, the article on 2014 July 28th.