Which retail psychology technique holds the Guinness World Record for the 'Largest Increase in Store Sales from a Single Environmental Change'?

The retail industry has seen some truly extraordinary records over the decades. From the largest shopping malls to the most expensive products ever sold, retail world records showcase the incredible scale and innovation of global commerce. This trivia question tests your knowledge about a fascinating consumer psychology phenomenon that set a world record and changed how retailers approach customer engagement.

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The implementation of 'slow music' in supermarkets, which increased average shopping time by 38%
The introduction of signature scents in hotels, which increased return bookings by 45%
The use of specific color psychology in fast food logos, which increased impulse purchases by 31%
The discovery of the 'Gruen Transfer' effect in mall design, which increased unplanned purchases by 62%