The yen’s world-beating rally against the dollar looks to be gathering momentum, as central bank inaction on both sides of the Pacific Ocean leaves inflation expectations to drive the exchange rate. Japan’s currency extended its climb to an 18-month high Monday after Bank of Japan Governor Haruhiko Kuroda refrained from adding to stimulus on Thursday. The Topix index slid for a fifth day as trading resumed after a break on Friday, during which the yen capped its steepest back-to-back gains since the global financial crisis. Bloomberg's Kevin Buckland and G Plus Economics Ltd Managing Director Lena Komileva discuss with Bloomberg's Guy Johnson on "Countdown."