As the world economy began to tank about five years ago, a curious thing happened at the top level of the international art market: It started to boom. At the annual spring art auctions at Sotheby's and Christie's in New York and their branches around the globe, deep-pocketed bidders snapped up Braques and Bacons, Klimts and Kandinskys, often at record prices.

Now with the global recession officially over but the American and European economies still shaky, auction records for blue-chip modern and contemporary art continue to be shattered. Just a few months ago, a pastel version of Edvard Munch’s "The Scream" (1895) fetched an astounding $119.9 million at Sotheby’s, by far the highest price ever paid at auction for a work of art, surpassing the winning bid of $106.5 million for Picasso's "Nude, Green Leaves and Bust" (1932) at Christie’s two years earlier. A week after the gavel fell on the Munch, Mark Rothko's "Orange, Red, Yellow" (1961) went for nearly $87 million, the artist’s personal best at auction.