Which retail innovation, first widely implemented in the 1930s, revolutionized visual merchandising by giving customers direct visual access to products without needing clerk assistance?

The history of retail has seen remarkable innovations that transformed how goods are sold and purchased. From small general stores to massive department stores, self-service concepts to digital marketplaces, retail history reveals the evolution of consumer culture and business practices. This trivia question focuses on a pivotal innovation in visual merchandising that changed how products were presented to consumers in the early 20th century.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Self-service display cases
Mannequin window displays
Rotating product carousels
Illuminated billboard advertisements