Week 2：What is the convenience store?

 Do you know correct definitions of the convenience store? I think that most people think that convenience stores are established anywhere. I actually thought it until I studied convenience stores. However, I knew that the convenience store had a correct definition and there were various definitions after having studied a convenience store. On this topic I explain these definitions.
 1: The convenience store is a small superstore to be from an early morning to the middle of the night or to treat mainly on articles necessary for everyday life.
This is the definition of Sanseido (is a book store).
 2: The convenience store is an establishment retailing various daily commodities mainly on the drink food by a self-service method. In addition, its store scale is small and it is an open office daylong or for along time. (Various daily commodities are products purchasing at high frequency routinely, in other words food and daily use miscellaneous goods. Foods sold at a convenience store are things which I can eat immediately without cooking.
This is the definition by the standard industrial classification that Ministry of Internal Affairs and Communications gave in Japan.
 3: The convenience store is a store treating food and using self-service method. In addition, its area is 20㎡〜250㎡ and its business hours are more than 14 hours.
This is the definition of the business condition classification in commercial statistics of Ministry of Economy, Trade and Industry.

However, actually, it is often open not 14 hours business describing by these definitions but 24 hours. But there is the movement to review opening for 24 hours in a cause for consideration to cost-effectiveness and global warming in the future. In addition, Foods sold at a convenience store are things which I can eat immediately without cooking. The price almost becomes the list price. This is because a price reduction is difficult. This reason are not stocking in large quantities at a time like a supermarket, and one piece of article management being formed by systems such as the POS.
 I gave three main definitions on this topic, but there seems to be still several it. This is the reason why I noted 'there are few related documents and the definition of convenience store are vague' on Week1's blog. The first Japanese convenience store which I described with Week1's blog changes by which definition you use. In addition, the name of the convenience store meant a shop handling food, products to offer for days namely convenience products, but mean a shop being convenience in Japan. Then why is the definition of the convenience store vague? I researched various documents about the thing, but was not listed.
 Did you know that such a definition exist in the convenience store. We do not call all of shops to treat mainly on from morning to the middle of the night or the article which it is without holiday, and is necessary for everyday life with a convenience store. You were able to understand a convenience store a little, weren't you? Next topic is 'Local convenience store'. Please look forward to the next topic. (522)