The Law of One Price

The law of one price

A) says that the supply and demand of a product must not alter its price.
B) says that if a retailer puts an item on sale,all other retailers must match that price.
C) says that identical products should sell for the same price in all countries.
D) is a principle suggested by Canadian economists that means that all identical products in a given economy should be sold for the same price.
E) is the principle that to be competitive,a company must offer its product at only one price; that is,it should not negotiate with customers about the price.