Final answer:
When a retailer removes one company's product and replaces it with a product from another company, the first company is said to have lost market share.
Step-by-step explanation:
When a retailer removes one company's product and replaces it with a product from another company, the first company is said to have lost market share. Market share refers to the portion of the total market that a company holds. So, when a retailer stops selling a product from a specific company and replaces it with a product from another company, it means that the first company's share of the market has decreased.