Which 19th century retail innovation first introduced the concept of 'customer experience' by allowing shoppers to browse freely without obligation to buy?

Throughout history, retail innovations have fundamentally transformed how customers experience shopping. From ancient marketplaces to digital storefronts, the evolution of customer experience has been shaped by technological breakthroughs and changing consumer expectations. This trivia question explores a pivotal moment in retail history that changed how businesses approached customer experience and laid groundwork for practices we now take for granted.

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The Bon Marché department store in Paris (1852)
Macy's cash-only policy in New York (1858)
Marshall Field's customer service department (1876)
Selfridge's window displays in London (1909)