Last year, the Bank of Japan undertook its most significant currency market interventions since 1998 to defend the Yen as it climbed to 150 against the dollar. Over the course of the next several months, the MoF (Ministry of Finance) and BoJ worked together to dump USDs and buy back Yen, holding the line by dumping $80B a month or so.
Now, the Yen has climbed back to 150 against the USD and a sharp move in forex markets today has many speculating that the MoF just did a mini-intervention.
Our fiat system is so broken.