Which innovative retail design feature, first widely implemented in the 1950s, significantly increased impulse purchases by forcing customers to navigate through more of the store?

In the world of retail and product development, understanding consumer psychology is crucial for success. One fascinating aspect is the science behind impulse buying - those unplanned purchases we all make despite our shopping lists and budgets. Test your knowledge about the psychological techniques that retailers and product designers use to trigger these spontaneous purchases!

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The Gruen Transfer layout (making main entrances lead to a central atrium)
The Serviceless Self-Service model (removing sales clerks)
The Serpentine Path (creating a winding single path through stores)
The Destination Department (placing essentials at the back of stores)