Which mythological concept most directly inspired the modern retail 'loyalty program' strategy where customers accumulate points or status based on repeat purchases?

Throughout history, mythology and folklore have influenced commerce and trade in fascinating ways. From ancient marketplace gods to legendary craftsmen, these stories have shaped how products were created, marketed, and sold. Today's retail strategies often unknowingly echo these ancient practices. This trivia question explores how mythological concepts have parallels in modern product marketing and brand loyalty strategies.

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The Norse concept of 'Gjallarhorn' - the horn that calls warriors to Valhalla after proving their worth in battle
The Greek Eleusinian Mysteries - secret religious rites where initiates progressed through stages of membership to gain exclusive knowledge
The Egyptian 'Weighing of the Heart' ceremony - where souls are judged by their accumulated deeds
The Celtic 'Samhain' festival - where the boundary between worlds temporarily dissolves, allowing special access to otherworldly goods