In which decade did department stores first widely adopt the scientific study of consumer psychology to deliberately place high-margin impulse items near store entrances?

Long before AI and big data, retailers were already developing sophisticated psychological tactics to influence shoppers. This trivia question explores a pivotal moment in retail history when consumer psychology first became a formalized science for increasing sales. Test your knowledge about when retailers began systematically applying psychological principles to store design and product placement.

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1920s, when Selfridges and Macy's hired behavioral psychologists to analyze shopping patterns
1950s, when post-war consumer culture emerged alongside modern marketing departments
1890s, when the first modern department stores established standardized floor plans
1970s, when computer systems first allowed tracking of consumer purchasing habits