Which company holds the world record for the highest documented customer lifetime value (CLV) for a single individual shopper?

The retail landscape has seen extraordinary milestones in customer lifetime value, with some shoppers demonstrating remarkable brand loyalty. Major companies track these metrics closely, and the results can be astonishing. Test your knowledge about the highest documented customer lifetime value (CLV) in retail history - a world record that showcases the power of customer retention strategies and brand loyalty in generating long-term revenue.

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Neiman Marcus (luxury department store) - $15.8 million from a Texas oil heiress over 45 years
Harrods (luxury department store) - $12.3 million from a Saudi royal family member over 30 years
Caesars Palace (casino/hospitality) - $14.1 million from a Chinese business magnate over 25 years
Christie's (auction house) - $18.2 million from an anonymous art collector over 50 years