Judging from the latest economic forecasts, Japan¡¯s central bank is falling even farther behind on meeting its 2 percent inflation target. Meanwhile, its efforts to keep interest rates down are bringing the bond market to the verge of a coma. So great is the Bank of Japan¡¯s buying to support its quantitative easing, traders may just stop showing up to work.

How to get out of this impasse? Officials must be more creative. One suggestion: Stop trying so hard to hit the inflation target.

As long as the 2 percent goal drives policy, the BOJ must keep muddling through until it¡¯s within reach. But the number is elusive: The bank now thinks it won¡¯t happen until 2021. This commits it to years of further stimulus, leaving it with scarce resources to combat any new slowdown ¡ª related, say, to the worsening U.S.-China trade spat. There¡¯s also mounting concern about the financial strains that years of negative interest rates are placing on regional banks. For a guy who likes to frame things in terms of sustainability, BOJ Gov. Haruhiko Kuroda looks to be on an unsustainable course.