London and New York, epicenters of cosmopolitan taste and bellwethers for the international art market, have long shared galleries, buyers, and a lingua franca. They both rake in huge annual sums at auction for contemporary sales—in 2013-2014 season, New York brought €541,331,656 to London’s €230,325,132. And though the Frieze Art Fair, which is currently in full swing and as hopping as ever, was originally a London product, it's now a dual brand.