Which retail innovation, first widely implemented in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Test your knowledge about a pivotal moment in retail history that transformed how we shop. In the early 20th century, shopping underwent a radical transformation that would forever change consumer culture and establish the foundation for modern retail experiences. This innovation revolutionized merchandising, customer experience, and ultimately paved the way for today's shopping malls and superstores. Do you know which retail innovation marked this turning point?

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Self-service shopping (where customers could browse and select items themselves)
Charge accounts (allowing customers to purchase now and pay later)
Mail-order catalogs (enabling shopping from home)
Price tags (displaying fixed prices rather than requiring haggling)