In Norse mythology, which artifact was considered the original 'loyalty program' that ensured devotion to Odin and was used as inspiration for modern customer retention strategies?

In many mythologies across the world, gods and heroes were associated with commerce, trade, and what we would now recognize as retail strategies. From Mercury (Hermes) as the god of merchants to the Norse god Njord who bestowed wealth, ancient cultures embedded retail wisdom in their myths. This poll tests your knowledge of how mythology and folklore intersect with modern retail loyalty concepts.

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Draupnir, the self-multiplying gold ring that 'rewarded' loyal followers with additional wealth every ninth night
Gungnir, Odin's spear that never missed its target, symbolizing precise customer targeting
Mjölnir, Thor's hammer that returned when thrown, representing customer return rates
Brisingamen, Freya's necklace that enhanced her beauty, representing the enhancement of brand image