Which selling technique involves encouraging a customer to purchase additional items?

The technique that involves encouraging a customer to purchase additional items is known as suggestive selling. This strategy focuses on offering customers recommendations or ideas for complementary products that enhance their initial purchase. For example, if a customer is purchasing a sandwich, a suggestive sell might involve recommending a side of chips or a beverage that pairs well with their choice. This approach helps create a more satisfying shopping experience for the customer while also increasing the overall sales for the business.

The other choices represent different sales techniques. Companion selling typically refers to promoting items that go together, but it’s not as focused on the act of suggestion as suggestive selling is. The gracious close covers the manner in which a sale is rounded off and does not imply the addition of extra items. Slice, show and offer is a specific technique for presenting a product but doesn't inherently encourage add-on purchases.