Which 19th-century retail innovation first introduced the concept of products being openly displayed and accessible for customers to browse without assistance?

Test your knowledge about one of the most significant transformations in retail history! The 19th century saw dramatic changes in how products were marketed, packaged, and sold to consumers. One innovation fundamentally changed the shopping experience, creating a blueprint for retail that continues to influence store designs and marketing strategies today. Can you identify this revolutionary retail concept that transformed how products were presented to consumers?

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The department store (like Bon Marché in Paris, 1852)
The Sears mail-order catalog (1893)
The Great Exhibition's Crystal Palace in London (1851)
The first customer loyalty program by B.T. Babbitt (1851)