Which advertising campaign holds the Guinness World Record for the highest return on investment (ROI) in retail history, generating over $14 billion in sales from just a $500,000 initial investment?

The world of retail has seen some truly extraordinary advertising campaigns that have broken records and changed the industry forever. These campaigns not only boosted sales but also created cultural phenomena and brand legacies that persist to this day. Test your knowledge about the advertising campaign that holds the Guinness World Record for the most successful retail marketing initiative based on ROI and global reach. Do you know which iconic campaign transformed an entire industry?

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Apple's 'Get a Mac' (Mac vs. PC) campaign
Nike's 'Just Do It' campaign featuring Michael Jordan
De Beers' 'A Diamond is Forever' campaign
Coca-Cola's 'Share a Coke' personalized bottle campaign