What innovative marketing strategy did Kylie Jenner use that revolutionized celebrity product launches and helped her cosmetics line generate $420 million in sales in just 18 months?

In 2019, a young celebrity entrepreneur made headlines by becoming one of the youngest 'self-made' billionaires through her cosmetics brand. Her marketing strategy revolutionized how celebrities leverage social media to build retail empires and became a case study in modern direct-to-consumer business models. How well do you know this influential pop culture retail phenomenon that changed how Gen Z interacts with brands?

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Using her massive social media following to create artificial scarcity through limited-edition 'drops' announced exclusively on her personal platforms
Traditional television advertising campaigns featuring celebrity endorsements from her family members
Becoming the first celebrity to offer subscription-based cosmetics through a monthly box service
Partnering with major department stores for exclusive in-store launch events and promotions