In many technology-based and service industries, firms offer ââ?¬Å?add-onââ?¬Â products to consumers who are\npurchasing (or have already purchased) a base product. For instance, electronic retailers usually offer a wide range\nof accessories (e.g. carrying cases, memory cards, keyboards, lenses) to consumers who purchase digital cameras\nor notebook computers. In the airline industry, service add-ons often include additional baggage allowance, alcoholic\nbeverages, movies and gaming consoles, often sold separately
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