Which retail innovation, introduced by Clarence Saunders in 1916, fundamentally changed how customers shopped and is now the standard format for most modern supermarkets and retail stores?

In the competitive world of retail, innovation can make or break a company's success. One particular retail strategy revolutionized how customers interact with products and transformed the shopping experience forever. Test your knowledge about this game-changing retail innovation that continues to influence modern shopping behaviors and has been widely adopted across various retail sectors. Do you know which retail strategy broke traditional shopping patterns and created a new standard?

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Self-service shopping (allowing customers to select their own merchandise without clerk assistance)
The installment payment plan (buy now, pay later in scheduled payments)
The satisfaction guarantee (money-back if not completely satisfied)
Loss leader pricing (selling select items below cost to attract customers)