PARIS, Aug. 31, 2021 /PRNewswire/ -- Will future generations consider Banksy the most important artist of the early 21st century? In any case, that's what the $123 million hammered in the first half of 2021 suggests, giving Banksy 5th position in Artprice's general ranking (all periods combined) just behind the giants Picasso, Basquiat, Warhol and...