Which celebrity-brand collaboration is credited with pioneering the 'equity partnership' model, where the celebrity received ownership stakes rather than just endorsement fees?

Celebrity endorsements have evolved dramatically in the retail world. No longer content with just appearing in advertisements, famous personalities are now active collaborators who shape product design, influence marketing strategies, and even control equity stakes. This trivia question explores a groundbreaking celebrity-brand collaboration that fundamentally changed how retailers and famous people work together, creating a new blueprint for partnerships that blend authentic personal connection with retail innovation.

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50 Cent and Vitamin Water (Glacéau)
Michael Jordan and Nike (Air Jordan)
Beyoncé and Pepsi
George Foreman and Salton Inc. (Foreman Grill)