Which retail innovation, developed by ancient Mesopotamians around 3000 BCE, revolutionized commerce by allowing merchants to track inventory and sales across multiple locations?

Before modern retail, ancient civilizations created sophisticated commercial systems that would influence trade for millennia. The Phoenicians, Egyptians, Romans, and other ancient societies developed marketing strategies, pricing mechanisms, and retail innovations that still echo in today's business practices. This trivia explores a fascinating innovation in ancient retail that revolutionized commerce in its time. Can you identify which ancient marketplace innovation was truly revolutionary for its era?

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Clay tablet accounting systems with cuneiform record-keeping
Stone loyalty tokens that customers could redeem for discounts on future purchases
Standardized packaging made from papyrus with merchant seals for product authentication
Seasonal pricing calendars based on astronomical observations and harvest cycles