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Wiktionary
demarketing

n. marketing where the goal is reducing the demand for goods or services. vb. (present participle of demarket English)

Wikipedia
Demarketing

Demarketing may be considered “unselling” or “marketing in reverse”, which includes general and selective demarketing.

Although the concept of demarketing lacks a precise theoretical definition, it refers to an attempt by the firm to discourage all or some of its customers from making purchases either temporarily or permanently. Since the initial interests in the subject area of how to market strategically in times of shortages began, different viewpoints have been offered as to how the firm should pursue demarketing.