Which 19th-century retail innovation is considered the first systematic approach to personalization and customer tracking before computers?

Before AI and big data, retailers had their own fascinating methods of personalizing customer experiences throughout history. This poll explores a pivotal innovation in retail personalization that changed how merchants interacted with their regular customers and revolutionized relationship marketing in the pre-digital era. Test your knowledge of retail history and the evolution of customer engagement practices!

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The charge plate system (metal identification plates with customer information for credit purchases)
The loyalty punch card (originated in tea shops where repeat customers received stamps toward free products)
The store account ledger with customer preference notes (handwritten books with customer histories)
The membership club model (exclusive shopping access for registered patrons with special pricing)