Another billion-dollar intervention is being discussed as the value of the Japanese yen continues to decline.

After crossing that threshold at the end of last month for the first time since November, the Japanese yen traded just above 140 against the US dollar on Monday.

The yen fell to levels last year that had not been seen since 1990 when Japan's Finance Ministry intervened to support the currency on three different days: Sept. 22, Oct. 21, and Oct. 24.

Typically unannounced, interventions include the central bank An....