Share of wallet (SOW) is the dollar/euro amount an average customer regularly devotes to a particular brand rather than to competing brands in the same product category.
Companies try to maximize an existing customer’s share of wallet by introducing multiple products and services to generate as much revenue as possible from each customer. A marketing campaign, for example, may have a stated goal of increasing the brand’s wallet share for specific customers at the expense of its competitors.
Cross-selling is the action or practice of selling an additional product or service to an existing customer.
The objective of cross-selling can be either to increase the income derived from the client or to protect the relationship with the client or clients.
Unlike the acquiring of new business, cross-selling involves an element of risk that existing relationships with the client could be disrupted. For that reason, it is important to ensure that the additional product or service being sold to the client or clients enhances the value the client or clients get from the organization.
Upselling is a sales technique where a seller invites the customer to purchase more expensive items, upgrades, or other add-ons to generate more revenue.
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 up-selling and cross-selling to maximize revenue.