In Norse mythology, which strategy did Odin use that best represents modern customer loyalty programs?

Throughout history, mythology and folklore have featured divine entities engaging in what we might recognize today as retail and commerce activities. From magical marketplaces to divine brand positioning, ancient stories often contain surprising parallels to modern business concepts. This trivia explores how mythological figures might have approached customer loyalty and brand positioning in their legendary domains.

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Sacrificing his eye for wisdom, symbolizing giving up short-term profit for long-term customer relationships
Offering mead from Heidrun the goat to warriors in Valhalla, providing exclusive rewards for his most loyal 'customers'
Wielding Gungnir, his never-missing spear, representing targeted marketing that always reaches the intended audience
Sending ravens Huginn and Muninn to gather information, similar to modern customer data collection practices