The Seoul-based Open Radio for North Korea (ORNK), citing unidentified sources along the Sino-North Korean border, said that merchants were exchanging one yuan for 1,000 new North Korean won as of late last month, plummeting from the 50 won traded for every yuan on Dec. 3, right after Pyongyang introduced the new currency. [Yonhap] If my math is right, that’s 1,000 percent in less than a month. Under the move, the communist country knocked two zeros off its currency without...