Personalizing promotional offers in marketing involves tailoring a sales offer or promotional mechanism specifically to each targeted individual. This increasingly common practice is widely used in e-commerce and through digital tools in loyalty programs, such as emails, mobile applications, and relationship programs. It can also be implemented via direct mail. Promotion personalization can be based on a person’s socio-demographic characteristics or their interest in promotions, determined from their purchase history. A concrete example would be an online retailer considering implementing personalized promotions.