Big Bazaar is a departmental store. 

Internal Trade is the buying and selling of goods within the geographical limits of a country.

The purchase of goods from a foreign country is called import. 

A warehouse keeper accepts goods for the purpose of storage.

Departmental stores act as the universal supplier of a wide variety of products.

Convenience in shopping, attract large number of customers and having a wide choice are all advantages of a mall.

General stores come under fixed shop small retailers.

Middleman is the person who comes in between the primary producer and final consumer

A businessman buying and selling goods in small quantities comes under retail trade. 

Retailers offer facilities for after-sales services.