It has not been a Merry Christmas season in the world of luxury goods. Shares in companies ranging from handbag maker Coach to jewellers Bulgari and Tiffany have sunk amid fears that a possible slowdown would cut into sales.

The world luxury index, created by Deutsche Borse this year to allow investors to track what was seen as a vibrantly growing sector, is down almost 16 per cent from its peak in early June.

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