Japan Has A Pile Of Dollars It Can Tap Before Selling Treasuries - BBG. Japan on Thursday intervened to prop up the yen for the first time since 1998, and to do so it had to get its hands on dollars to sell. Japan on Thursday intervened to prop up the yen for the first time since 1998, and to do so it had to get its hands on dollars to sell. Japan on Thursday intervened to prop up the yen for the first time since 1998, and to do so it had to get its hands on dollars to sell @marketsより. Japan has a pile of dollars it can tap before selling treasuries..