
ãã¢ã«ãããã¯ãªè²¢ç®ðããEffects of the Bank of Japanâs intervention on yen/dollar exchange rate volatilityãïŒå è¡ç 究解説 No2 2023/08/31
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Effects of the Bank of Japanâs intervention on yen/dollar exchange rate volatility
Toshiaki Watanabe (a), Kimie Harada (b)
(a)Faculty of Economics, Tokyo Metropolitan University, 1-1 Minami Ohsawa, Hachioji-shi, Tokyo 192-0397, Japan
(b)Graduate School of International Accounting, Chuo University, 42-8 Honmura-cho, Ichigaya, Shinjuku, Tokyo 162-8473, Japan Received 18 September 2002; revised 13 February 2004 Available online 21 November 2004
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Effects of the Bank of Japanâs intervention on yen/dollar exchange rate volatility
Watanabe, Toshiaki, and Harada, Kimie
2. Data descriptionâ
ãWe used the following data to test for the effects of the BOJâs intervention on the level and volatility of the yen/dollar exchange rate: the yen/dollar exchange rate, the amount of intervention by the BOJ and the Fed, and interest rates. The yen/dollar exchange rate data are the daily closing spot prices in the New York market. The BOJ and Fed intervention data are daily official yen/dollar transactions measured in yen and dollars, respectively. The daily closing spot price of the yen/dollar exchange rate is plotted with the daily amount of BOJâs intervention in Fig. 1, and the daily amount of Fed intervention in Fig. 2, respectively.
While most of the BOJâs interventions are unilateral, there is no unilateral Fed intervention and the Fedâs interventions are always accompanied by BOJâs interventions. The Fed intervention data is used to capture the effects of coordinated intervention.
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ãThe observation period in this study ranges from April 1, 1991âwhen the first data on the BOJâs official intervention data become availableâto March 31, 2003. Papers that analyze the effectiveness of intervention using the same sample period and official intervention data are limited.
Former studies that used GARCH-type models were mostly based on perceived intervention reported by newspapers or wire services, and they did not analyze the effectiveness of intervention in the late 1990s.
Hillebrand and Schnabl (2003) identify two subperiods, from 1991 to 1998 and from 1998 to 2003, based on the impacts of foreign exchange intervention on the yen/dollar exchange rate.
Ito (2002) divides the sample period at June 1995 based on the findings that the intervention styles of the Japanese authorities were different before and after June 1995 in terms of frequency and per-intervention amount.
The evidence for this is also obvious from Fig. 1.
Ito (2002) has pointed out that predictability of the market also changed over the period, and has found that BOJâs intervention was not effective in the first half of the 1990s, but was effective in the second half.
We analyze the two subsamples separately, based on the findings of Ito (2002). One is from April 1, 1991 to June 20, 1995, which we call the first half, and the other is from June 21, 1995 to March 31, 2003, which we call the second half of the sample period. Our choice is, therefore, not arbitrary.
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