Marketing campaign involves advertising, hiring a staff of salesmen and women to go out and solicit business, and finding retailers who will carry your product on their shelves. Promotion is temporarily reducing the cost of your retail product (discount sale) to steal your competitors' customers, by trying to convince consumers to switch services or name brands. People are creatures of habit; they'll routinely buy the same brand of products or services, until a better value comes along to entice them to switch.