Upselling
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Upselling is a sales technique whereby a seller induces the customer to purchase more expensive items, upgrades or other add-ons in an attempt to make a more profitable sale. While it usually involves marketing more profitable services or products, it can be simply exposing the customer to other options that were perhaps not considered. (A different technique is cross-selling in which a seller tries to sell something else.) In practice, large businesses usually combine upselling and cross-selling to maximize profit. In doing so, an organization must ensure that its relationship with the client is not disrupted.
Business models as freemium or premium could enter in this techniques.