"where value emerges for customers and is perceived by them"

"Nowhere is the idea that enterprises make and deliver value more evident than in the concept of "value added." Value added has been a ter used to describe the process of firms transforming matter to change its form, and its time, place, and possession. Predictably, these transformations require effort and thus costs, and these costs  became labeled "value added" and often identified as a source of "utility." However, offerings (tangible or intangible) are not embedded with value (valu-in-exchange) or utility but rather value occurs when the offering is used.
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Accountants might believe that an unsold good has value but this is economic value; value creation from an actor-centric and service-dominant vantage point is only possible when market and other offerings are used - that is, when they contribute to the well-being of some actor in the context of his or her life.
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With G - D logic, the value is embedded during production and distribution/marketing without the involvement of the actor who will become the beneficiary of the enterprise's offering. Early scholars in the area of services marketing succinctly identified the problem with G - D logic. For example, Gumesson argued: "if the consumer is the focal point of marketing, value creation is only possible when a good or service is consumed. An unsold good has no value, and a service provider without customers cannot produce anything." Similarly, Groonroos stated:
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Value for customers is created throughout the relationship  by the customer, partly in interactions between the customer and the supplier or service provider. The focus is not on products but on the customers' value-creating processes where value emerges for customers and is perceived by them ... the focus of marketing is value creation rather than value distribution, and facilitation and support of value-creating processes rather than simply distributing ready-made value to customers."

Trecho retirado de "Service-Dominat Logic: Premises, Perspectives, Possibilities" de Robert Lusch e Stephen Vargo.