1. TRUE - A person who buys goods or services is commonly referred to as a "consumer."2. TRUE - Someone who offers something for sale is often referred to as a "seller" or "vendor."3. TRUE - To be successful in selling, one must learn the art of offering products or services effectively.4. FALSE - Not anybody who makes a purchase of products can be considered a "seller." This role is typically associated with the act of selling goods or services.5. TRUE - The person who buys goods or services in the market or store is commonly known as a "shopper" or "customer."