Can a Work of Art Be More Valuable When Not One of a Kind?

In the world of art and collectibles, rarity usually adds value. Uniqueness can be almost priceless.

Here's a contrary example: Giacometti's "Chariot," which just sold at Sotheby's for $101 million. The sculptor produced 'Chariot" in an edition of six, and in this case, Felix Salmon asserts, lack of uniqueness added value.