Sotheby's believes that one man's collection is another man's treasure -- especially when that collection is a rare antique, a unique collectible, or a distinctive work of art. Along with rival Christie's International, Sotheby's dominates the world's auction house market. It orchestrates hundreds of sales each year at its auction centers, dealing mainly in fine art, antiques, and collectibles. Sotheby's receives commissions and fees from both the buyer and the seller on each sale. It also provides loans (secured against works of art) to clients as part of its finance services, and acts as an art dealer through its Noortman Master Paintings business, which specializes in Dutch, Flemish, and French paintings.