Which ancient Roman retail innovation was specifically designed to gather customer feedback and improve merchant operations in their marketplace system?

While we often think of retail as a modern concept, ancient civilizations had sophisticated marketplace systems that shaped their economies and societies. These early retail operations required careful planning, logistics, and customer understanding. This trivia question explores how ancient Romans revolutionized retail operations through their marketplace innovations and how they gathered customer feedback to improve their commercial enterprises.

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The Taberna Evaluation System - where customers placed colored tokens in urns to rate merchant service quality
The Forum Scroll Registry - where scribes recorded marketplace transactions and disputes
The Mercatus Coin - a special currency that could only be spent at highly-rated merchants
The Praefectus Commercium - officials who audited marketplace vendors and enforced quality standards