FILE PHOTO: A Hong Kong dollar note is seen in this illustration photo May 31, 2017. REUTERS/Thomas White/Illustration SINGAPORE : Billionaire investor Bill Ackman said he's betting the Hong Kong dollar can fall and said it's matter of time before its peg to the U.S. dollar breaks. "We have a large notional short position against the Hong Kong dollar through the ownership of put options," he said on Twitter. "The peg no longer makes sense for Hong Kong."