After seeing its swiftest rise in value — peaking in 2007 and last year — the market is experiencing a rapid fall. At its height buyers were paying $72 million for an Andy Warhol screenprint and $86 million for a Francis Bacon. By contrast, neither of the catalogues for the contemporary art sales being held by Sotheby's and Christie's in New York this week contains an estimate for a work of more than $10 million. Last May Christie's made $331 million from its contemporary art evening sales. This year it is aiming for $105 million. Sotheby's made $362 million last May and is aiming for a maximum $73 million this month.