Which retail innovation, first introduced in the 1850s, revolutionized shopping by allowing customers to browse merchandise freely without clerk assistance and introduced fixed pricing?

Throughout history, retail has evolved dramatically from simple bartering to complex shopping experiences. The development of retail formats has shaped economies, consumer behavior, and even urban development. This trivia question focuses on a pivotal moment in retail history that transformed how people shop and influenced product marketing strategies for generations to come.

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Department stores (like Le Bon Marché in Paris)
Mail-order catalogs (like Montgomery Ward)
Arcade shopping galleries (like Burlington Arcade)
Cooperative retail societies (like Rochdale Pioneers)