Analysis: Japan is chasing its tail on yen intervention

As the Bank of Japan steps into currency markets for the first time in decades to defend a battered yen, it is running into numerous obstacles, chiefly its own stubborn commitment to ultra-easy monetary settings.
Analysis: Yen’s past points to more pain ahead

The yen has tumbled 10% to a two-decade low to the dollar in a matter of weeks. But history suggests that still isn’t cheap, and investors are betting that it’s going to fall even further.