Final answer:
All options listed, which include advertising, convenience, useful features, and branding, have the potential to add value to a product by influencing consumer perception and enhancing the product's appeal and functionality.
Step-by-step explanation:
The question pertains to which aspects do not add value to a product. However, none of the provided options (advertising, convenience, useful features, branding) inherently fail to add value. Instead, each of these can significantly influence the perceived value of a product in different ways.
Advertising and branding create awareness and can shape consumer preferences, often making products more desirable. Convenience enhances the customer experience and can make a product more attractive because it saves time or simplifies the user's life. Useful features provide practical benefits that enhance the product's functionality and appeal to consumers, addressing specific needs or problems.
It is noteworthy that physical aspects such as design, materials, and location of sale (like a gas station at a busy intersection) also add to a product's value. On the other hand, intangible aspects like guarantees, reputation, and customer services further differentiate products. Ultimately, all the options listed can add value, and factors like consumer perception, advertising influence, and product differentiation play essential roles in creating and enhancing a product's value.