Final answer:
Product quality is a major positioning tool for marketers because it affects product performance, customer value, and satisfaction.
Step-by-step explanation:
Product quality is one of the marketer's major positioning tools because it has a direct impact on product or service performance, which is closely linked to customer value and satisfaction. When a product has high quality, it is more likely to meet or exceed customer expectations, leading to higher satisfaction. For example, a smartphone that is durable, reliable, and performs well will be perceived as having good quality, enhancing its positioning in the market.