Which pioneering retail psychological technique, first widely implemented in the 1920s, used strategic store layouts to influence purchasing decisions and is still fundamental to modern retail design?

In the annals of retail history, certain innovations fundamentally changed how consumers interact with products and brands. The early 20th century saw revolutionary developments in consumer psychology that still influence modern marketing strategies. This trivia challenges you to identify a pivotal moment when retailers first began scientifically studying consumer behavior to drive sales - a practice that would transform the industry forever.

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Planned obsolescence - deliberately designing products with limited lifespans
Atmospherics - manipulating store environment elements like lighting, music and scent
Impulse purchase engineering - strategically placing small, affordable items near checkout areas
Aspirational marketing - associating products with desirable lifestyles through celebrity endorsements