Which historical innovation, introduced in the 1930s, revolutionized retail customer feedback by allowing businesses to systematically collect consumer opinions?

The way businesses collect and respond to customer feedback has evolved dramatically throughout history. Before digital surveys and social media, retailers had to find creative ways to understand what their customers wanted. This poll explores a pivotal innovation in retail customer feedback that changed how businesses approached consumer insights and helped shape modern customer service practices.

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The Market Research Department at Procter & Gamble (established 1924)
The Suggestion Box (popularized in the late 19th century)
The Hooper Holmes Customer Satisfaction Index (1937)
The Gallup Poll methodology for retail (1935)