
ãçµè«ã®ç解床ãäžããð¥ãOfficial Japanese Intervention in the JPY/USD Exchange Rate Market: Is It Effective and Through Which Channel Does It Work?ðBoJ Report No.10 Finalð
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Official Japanese Intervention in the JPY/USD Exchange Rate Market: Is It Effective and Through Which Channel Does It Work?
Rasmus Fatum*
IMES Discussion Paper Series
2009-E-12 March 2009
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5. Conclusion
This paper analyzes whether official Japanese intervention in the JPY/USD exchange rate over the January 1, 1999 to March 31, 2004 time period is effective.
By distinguishing between intervention of which the market is aware and intervention of which the market is unaware, the paper also attempts to shed some light on through which of the two channels, the signaling or the portfolio balance channel, Japanese intervention, if effective, works.
Intervention on days when a rumor of intervention is reported on the newswire is used as a proxy for intervention of which the market is aware, and intervention on days without a rumor of intervention on the newswire is used as a proxy for intervention of which the market is unaware.
The analysis also assesses the impact of official statements (âoral interventionâ or âcentral bank communicationâ) and whether the first day of intervention after a day, or days, of no intervention, and whether the first day of no intervention after a day, or days, of intervention, constitute days of particular interest in the context of intervention and exchange rate movements.
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Using primarily a standard GARCH time series methodology, the results of the analysis show that for the January 1, 1999 to December 31, 2004 time period, actual intervention, whether or not the market is aware of the intervention, exerts a significant same-day influence on the JPY/USD exchange rate.
The analysis does not detect a systematic and significant link between days when there is a rumor of intervention, but no intervention occurs, and the JPY/USD exchange rate.
For the first quarter of 2004, the analysis shows that neither actual intervention nor rumors of intervention on no intervention days have any impact on the JPY/USD exchange rate.
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The evidence of effectiveness of intervention of which the market is aware can be ascribed to the workings of the portfolio-balance channel as well as the information signaling channel.
The evidence of effectiveness of intervention of which the market is unaware points to the former channel being at work.
The analysis fails to find any evidence of effectiveness of rumors of intervention on days when no intervention occurs, thus no evidence directly supports that the latter channel is at work.
The paper, therefore, cautiously concludes that the importance of the portfolio-balance channel is supported by the data while no direct evidence of the information signaling channel is found.
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Official statements in support of more intervention as well as official statements casting doubt on the likelihood of more intervention are both found to be insignificant across all model specifications and samples. Clearly, this is in contrast with studies that find a significant exchange rate impact of official statements.
However, the influence of official statements is likely sample specific, and since the sample under study contains nothing but frequent and unilateral JPY intervention sales it is unlikely that there is much uncertainty in the market regarding the desire of the intervening authority to depreciate the JPY.
Accordingly, official statements made during the period under study do not contain enough new information to significantly affect the exchange rate market.
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With respect to the first day of intervention, the analysis finds strong and robust evidence that for the January 1999 to December 2004 time period the first day of intervention following a no intervention day has a larger than average impact on exchange rates.
Some sample specific evidence that the first day after intervention is associated with an adverse exchange rate adjustment is found.
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Reaction function studies of Japanese intervention are generally at least modestly successful in modeling current intervention using explanatory variables such as lagged intervention and lagged exchange rate movements.
It follows that intervention on any given day, whether or not the market is aware of the intervention operation, contains an expected as well as an unexpected component.
A limitation of this and most other intervention studies is that no attempt is made to distinguish between expected and unexpected intervention. 30
A natural extension of the present study is to disentangle the unexpected component of official Japanese intervention and, in turn, reassess the effectiveness of unexpected Japanese intervention and the channels through which it works.
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çµæžç ç©¶ãVol.54 No.2 Apr. 2003
ãEffects of the Bank of Japanâs intervention on yen/dollar exchange rate volatilityã21 November 2004
Toshiaki Watanabe (a), Kimie Harada (b)
ãThe Effects of Japanese Foreign Exchange Intervention: GARCH Estimation and Change Point Detectionã
Eric Hillebrand Gunther Schnabl Discussion
Paper No.6 October 2003
Author/Editor:Jaromir Benes ; Andrew Berg ; Rafael A Portillo ; David Vávra
Publication Date: January 14, 2013
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