A rivalry is the state of two people or groups engaging in a lasting competitive relationship. Rivalry is the "against each other" spirit between two competing sides. The relationship itself may also be called "a rivalry", and each participant or side a rival to the other.
Domestic business involves those economic transactions that take place inside the geographical boundaries of a country. Both the buyer and seller belong to the same country in this form of business. Domestic business is also known as 'Internal Business' or 'Home Trade'