High selling rates may be attributed to the lowered estimates on 54 lots (2 unsold) at Sotheby’s Wednesday evening sale. While the $134 million total paled against the company’s May 2008 record tally of $362 million, prices for Warhol's "200 One Dollar Bills" ($43.8 million), David Hockney’s “California Art Collector” ($7.9 million), and a record-setting $6.1 million for Dubuffet, signaled to some that the art market slump is over.