Which historic retail advertising slogan from the 1980s broke traditional marketing norms by directly acknowledging a competitor and is credited with increasing the company's market share by 15%?

Throughout history, certain retail advertising slogans have become so iconic they transformed how companies marketed themselves and connected with consumers. These taglines not only defined brands but also reflected changing societal values and consumer expectations across different eras. This trivia question challenges your knowledge of a groundbreaking retail slogan that revolutionized an industry and set new standards for advertising effectiveness.

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Avis: 'We're #2. We try harder.'
Wendy's: 'Where's the beef?'
American Express: 'Don't leave home without it.'
De Beers: 'A diamond is forever.'