Mark Anderson
In many technology-based and service industries, firms offer “add-on” products to consumers who are purchasing (or have already purchased) a base product. For instance, electronic retailers usually offer a wide range of accessories (e.g. carrying cases, memory cards, keyboards, lenses) to consumers who purchase digital cameras or notebook computers. In the airline industry, service add-ons often include additional baggage allowance, alcoholic beverages, movies and gaming consoles, often sold separately.
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