Which mythological object's marketing strategy sparked intense competition and is now studied as an early example of creating artificial scarcity in retail?

In mythology, certain artifacts and symbols have influenced modern marketing strategies. The golden apple from Greek mythology, for instance, represents desire, competition, and premium value positioning - concepts still used in luxury product marketing today. This trivia explores how a famous mythological marketing strategy connects to contemporary retail competition tactics.

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The Golden Apple of Discord, marketed as 'For the Fairest' with intentionally limited availability to create competition among goddesses
Thor's Hammer Mjölnir, advertised as a limited-edition power tool available only to those deemed worthy by the manufacturer
The Philosopher's Stone, marketed with tiered pricing depending on how much gold a customer wished to create
Excalibur, which used an influencer marketing campaign featuring testimonials from knights who had tried to pull it from the stone