Times have become so tough that Liu Yiqian, the Chinese taxi driver turned billionaire who once famously purchased a Modigliani painting for $170 million using his Amex credit card, had to sell another Modigliani from his own collection, at a staggering loss of $13 million.
byChinese art collector Liu Yiqian shook the art world with his ultra-expensive purchases and unabashed flair for the…