Which technique involves encouraging a customer to upgrade their purchase?

The technique that involves encouraging a customer to upgrade their purchase is known as up-selling. This strategy focuses on persuading the customer to purchase a higher-end version of a product or service than what they initially intended. Up-selling is an effective approach in customer service as it not only enhances the customer's experience by suggesting products or services that may better meet their needs, but it can also increase the sales revenue for the business.

While cross-selling refers to selling complementary products to what a customer is already interested in, up-selling specifically targets the enhancement of their current purchase by encouraging them to choose more expensive, higher quality, or additional features. Down-selling, on the other hand, is aimed at suggesting a less expensive option, which contrasts with the concept of up-selling. Bulk-selling typically involves selling larger quantities of a product at a discounted price, rather than focusing on upgrading an individual purchase.