Japanese Industrial Production Prel (Aug MM) -1.7% vs. Exp. 1.7% (Prev. -0.2%)

Japanese industrial production is a series where the preliminary print routinely lands well wide of consensus, because forecasts lean heavily on the METI survey of production plans, which has a long record of overstating output when orders soften. A miss of this size against a positive expectation fits the familiar pattern of the survey-based consensus failing to capture a downside swing, and the prior revision risk runs both ways since the final reading often moves materially from the prelim. The transmission channel for FX is narrow: Japanese activity data of this kind has historically moved USD/JPY only at the margin unless it shifts the perceived timing of policy normalisation, and it is the BoJ reaction function rather than the growth print itself that carries the signal. The distinction worth drawing is between a one-off, often autos or supply-chain driven, monthly drop and a second consecutive contraction, since the latter is what feeds into the BoJ's assessment of the output gap. The follow-ons are the METI revision, the production forecast for the following month contained in the same release, and whether officials flag the weakness in subsequent commentary.