In Greek mythology, which retail strategy did the ferryman Charon use to ensure payment for his services across the River Styx?

Long before modern marketing, mythological figures and folkloric entities employed their own unique 'retail strategies' to distribute magical items, curses, or blessings. From Norse gods trading wisdom for sacrifices to fairy markets where time itself was currency, the ancient world had fascinating 'commerce' systems. Test your knowledge about how mythological retail operations functioned across different cultures and legends!

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He implemented a pre-payment system where coins were placed in the deceased's mouth before burial (the obol)
He offered a loyalty program where frequent travelers received discounted fares on subsequent journeys
He employed dynamic pricing, charging heroes less than ordinary souls to cross the river
He used a barter system, accepting personal items of sentimental value instead of currency