Which retail innovation from the 1930s is considered the first formal, systematic customer feedback program that influenced modern customer satisfaction measurement?

Before digital surveys and social media feedback channels, retail businesses had to innovate different ways to understand their customers. The history of customer feedback mechanisms reveals fascinating insights into how businesses evolved their approach to consumer opinions. This question explores a pivotal moment in retail feedback history that transformed how companies gathered and utilized customer insights, setting the foundation for modern customer experience practices.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Mystery Shopper Program pioneered by Willmark Service System
Montgomery Ward's 'Customer Opinion Cards' attached to mail-order packages
Sears Roebuck's 'Satisfaction Guarantee' return policy and tracking system
A&P's in-store 'Suggestion Box' campaign for product recommendations