As extensively discussed yesterday in the aftermath of the BOJ’s stunning decision to cut rates to negative for the first time in history (a decision which it appears was taken due to Davos peer pressure, a desire to prop up stock markets and to punish Yen longs, and an inability to further boost QE), there will be consequences – some good, mostly bad.

As Goldman’s Naohiko Baba it appears was taken , NIRP in Japan will not actually boost the economy: “We do have concerns about the policy transmission channel. Policy Board Member Koji Ishida, who voted against the new measures, said that “a further decline in JGB yields would not have significantly positive effects on economy activity.” We concur with this sentiment, particularly for capex. The key determinants of capex in Japan are the expected growth rate and uncertainty about the future as seen by corporate management according to our analysis, while the impact of real long-term rates has weakened markedly in recent years.”

What the BOJ’s NIRP will do, is result in a one-time spike in risk assets, something global stock and bond markets have already experienced, and a brief decline in the Yen, one which traders can’t wait to fade as Citi FX’s Brent Donnelly explained yesterday.

NIRP will also have at most two other “positive” consequences, which according to Deutsche Bank include 1) reinforcing financial institutions’ decisions to grant new loans and invest in securities (if only in theory because as explained further below in practice this may very well backfire); and 2) widening interest rate differentials to weaken JPY exchange rates, which in turn support companies’ JPY-based sales and profit, for whom a half of consolidated sales are from overseas.

That covers the positive. The NIRP negatives are far more troubling. The first one we already noted yesterday, when Goldman speculated that launching NIRP could mean that further QE is all tapped out: