To cross-sell is a phenomenon in sales that means to sell a product to a customer because of the initial product that they purchased. A great example would be purchasing a memory card because one purchased a mobile phone.
Trading up simply refers to giving up a product for a more expensive one. An example would be trading up a 1995 Mercedes Benz for a 2022 BMW.
The two sales phenomenon described above can be used as strategies for sales.
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