Which revolutionary retail innovation, introduced in 1852, fundamentally changed how products were marketed and sold by establishing fixed prices rather than the traditional haggling system?

Throughout history, retail and commerce have evolved dramatically, shaping civilizations and economies. From ancient marketplaces to medieval trade routes, commercial innovations have driven historical progress. This trivia question explores a pivotal moment in retail history that transformed how goods were marketed and sold, creating ripple effects that influenced modern commerce principles we still use today.

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Le Bon Marché department store in Paris
Montgomery Ward mail-order catalog in Chicago
The Great Exhibition's Crystal Palace in London
Singer Sewing Machine Company's installment plan