What unique product positioning strategy did the Phoenicians use to dominate the ancient Mediterranean luxury market and distinguish their goods from competitors?

The ancient Phoenicians were master traders who dominated Mediterranean commerce from 1500-300 BCE. Their remarkable success wasn't just about ships and routes - they pioneered what we'd now call strategic brand positioning. Their distinctive purple-dyed textiles, cedar wood products, and glassware were positioned as luxury items across the ancient world, creating powerful market associations that helped them dominate trade for over a millennium. How well do you know their product positioning strategies?

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Their exclusive 'Tyrian purple' dye, extracted from rare sea snails, created textiles that were prohibitively expensive and became status symbols for royalty across civilizations
Their 'Sidon seal' certification mark stamped on pottery, guaranteeing authenticity and quality standards across all their trading posts
Their 'Byblos parchment' loyalty program, where repeat customers received personalized papyrus certificates offering discounts on future purchases
Their 'Carthage promise' money-back guarantee, allowing unsatisfied customers to return products to any Phoenician trading post for full refund