The world's most expensive product varies depending on the category, but here are a few examples:

 Yacht: The world's most expensive yacht is the History Supreme, which reportedly cost $4.8 billion.

Car: The world's most expensive car is the Bugatti La Voiture Noire, which sold for $19 million.

Watch: The world's most expensive watch is the Graff Diamonds Hallucination, which is valued at $55 million.

Perfume: The world's most expensive perfume is Clive Christian No. 1, which sells for $2,150 per ounce.

Handbag: The world's most expensive handbag is the Mouawad 1001 Nights Diamond Purse, which is valued at $3.8 million.

Note that these prices may vary depending on factors such as availability and demand.