
ãèŠçŽåããèªè§£åðããThe Effects of Japanese Foreign Exchange Intervention: GARCH Estimation and Change Point DetectionãïŒå è¡ç 究解説 No.16 2023/10/01
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ãThe Effects of Japanese Foreign Exchange Intervention: GARCH Estimation and Change Point Detectionã
Eric Hillebrand Gunther Schnabl Discussion
Paper No.6 October 2003
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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)
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The Effects of Japanese Foreign Exchange Intervention: GARCH Estimation and Change Point Detection
Eric Hillebrand Department of Economics, Louisiana State University
Gunther Schnabl Department of Economics and Business Administration, Tuebingen
7. Conclusions
During the post-bubble economic slump the sustained yen appreciation has triggered increasing foreign exchange intervention.
Our global GARCH estimation supports the recent findings by Ito (2002) and Fatum and Hutchison (2002) that Japanese foreign exchange intervention has been successfulâat least on the same day.
Segmentation approaches that allow for local estimations reveal however, that the success depends on the time period.
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ç§ãã¡ã宿œããã°ããŒãã«ãªGARCHæšå®ã¯ãæ¥æ¬ã®çºæ¿ä»å
¥ãå°ãªããšã忥ã«ã¯æåããããšããIto (2002) ããã³ Fatum and Hutchison(2002)ã«ããæè¿ã®èª¿æ»çµæãè£ä»ããŠããŸãð
ãã ãã屿çãªæšå®ãå¯èœã«ããã»ã°ã¡ã³ããŒã·ã§ã³ã®ã¢ãããŒãã§ã¯ãæåãæéã«äŸåããããšãæããã«ãªããŸãã
Up to 1998 there is no conclusive evidence for effective intervention as argued by Jurgensen (1983) and Dominguez (1998).
After 1999 official Japanese foreign currency purchases seem to have reached their targets supporting the arguments of Ito (2002) and Fatum and Hutchison (2002).
In Section 6 we have provided two explanations for the changing pattern.
The most plausible explanation is that money supply is infinite in the liquidity trap and therefore sterilized intervention corresponds to unsterilized intervention.
Jurgensen(1983)ãšDominguez(1998)ã䞻匵ããããã«ã1998幎ãŸã§ã¯å¹æçãªä»å
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ãããã1999幎以éãæ¥æ¬ã®é貚åœå±ã宿œãããªãã£ã·ã£ã«ãªå€åœçºæ¿å¹³è¡¡æäœã¯ãIto(2002)ããã³FatumãšHutchison(2002)ã®è°è«ãè£ä»ãã蚌æ ã«éããããã§ã
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We have also examined the impact of Japanese foreign exchange intervention on the volatility in the yen/dollar markets.
The results were less conclusive than in our mean equations and the endogeneity problem cannot be solved completely.
The global estimation provided evidence that foreign exchange intervention increases exchange rate volatility as suggested by Schwartz (1996), Bonser-Neal and Tanner (1996) and Galati and Melick (1999).
For the local estimations the results are less clear-cut. In the period up to 1998 in some years foreign exchange intervention seems to have increased exchange rate volatility.
Since 1999 however, we find evidence that interventions may have reduced exchange rate volatility, which can be explained by the success of intervention.
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Schwartz(1996)ãBonser-Neal and Tanner(1996)ãGalati and Melick(1999)ã瀺åããããã«ãäžçèŠæš¡ã§ã®GARCHã¢ãã«ã«ããæšèšã¯å€åœçºæ¿ä»å
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Note that our GARCH estimations only scrutinized the short-term effects of foreign exchange intervention. The long-term perspective is beyond the scope of this paper.
Nevertheless recently, McKinnon and Schnabl (2003) have observed reduced month-to-month yen/dollar exchange rate volatility since the year 2002, which might give evidence for successful exchange rate stabilization even in the longer run. This phenomenon is worth further examination.
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è¡ç ç©¶ã«ãããGARCHæšèšã¯ãçºæ¿ä»å
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ããã«ãããããããæè¿ã§ã¯ãMcKinnonãšSchnabl(2003)ã¯ã2002幎以éãå/ãã«çºæ¿ã¬ãŒãã®æããšã®ãã©ãã£ãªãã£ãäœäžããŠããããšã芳å¯ããŠãããé·æçã«èŠãŠãçºæ¿ã¬ãŒãã®å®å®åãæåããŠãã蚌æ ãšãªãå¯èœæ§ããããŸã
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Finally, the change point detector identified changes in the volatility parameter regime, which could beâto some degreeâmatched with intervention periods.
As the results are sensitive to the choice of the sample period, the application of this very young approach to foreign exchange intervention needs further research.
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