Which groundbreaking market research method, first widely adopted by major retailers in the 1950s, revolutionized consumer preference analysis?

Before the digital age, retail giants had to rely on creative methods to understand customer preferences. In the mid-20th century, one breakthrough research technique revolutionized how retailers gathered consumer insights, leading to fundamental changes in product development and store layouts. This polling innovation remains influential in modern market research methodology, though it has evolved significantly with technology. Test your knowledge of this pivotal moment in retail history!

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Focus groups - structured discussions with 6-10 consumers in a moderated setting
Mail-in punch cards that consumers used to rank product preferences
Store exit interviews conducted by trained psychologists
Home visit observations where researchers monitored family shopping behaviors