what is the name for a single company dominating an entire market
Market structure 3. Monopoly, where there is only one provider of a product or service.
Corporation In American English, the word corporation is most often used to describe large business corporations.[4] In British English and in the Commonwealth countries, the term company is more widely used to describe the same sort of entity while the word corporation encompasses all incorporated entities. In American English, the word company can include entities such as partnerships that would not be referred to as companies in British English as they are not a separate legal entity.