If the product or service that contributes to the impression of an advantage. And the effect on the customer satisfaction is reusable. Tell the people around you. And a sense of loyalty to your products or services are used.
If the goods or services it produces a special impression and outcome when a satisfied customer is a repeat has been telling people around and feel loyalty towards the product or service.
If the product or service that creates especially impressive and results when the customer is satisfied with the result of repeatedly to tell people around and feel loyal to the product or service.