Which product holds the Guinness World Record for being the most expensive single retail item ever sold?

The world of retail has seen some truly extraordinary transactions throughout history. From priceless artifacts to luxury properties, the upper limits of what consumers are willing to pay continues to astound market analysts. This trivia explores the pinnacle of high-value retail transactions and tests your knowledge about the most expensive single retail item ever sold. Think carefully about what product category might command such an astronomical price!

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The 'Salvator Mundi' painting by Leonardo da Vinci, sold at Christie's auction house for $450.3 million
The 'L'Homme au doigt' (Pointing Man) sculpture by Alberto Giacometti, sold for $141.3 million
The 'Oppenheimer Blue' diamond, sold at Christie's auction house for $57.5 million
The Antilia private residence in Mumbai, purchased for $2 billion as a single retail transaction