Japanese authorities will probably need to sell Treasuries in the event they step in to support the beleaguered yen, rather than just tapping cash parked in a key Federal Reserve facility, according to Citigroup Inc. Use of the Fed’s foreign reverse repurchase agreement facility — where global monetary officials keep cash overnight — has swelled by about $32 billion in the past three weeks, reaching a three-month high of $365 billion. The influx sparked speculation that Japanese policymakers were boosting their dollar cash holdings in preparation for a move to buoy the yen, which is trading near a 34-year low ... (full story)