Won and yen surge simultaneously…Unusual market movements emerge

The Korean won and Japanese yen experienced sharp appreciation at similar times the previous night, marking unusual movements in the international foreign exchange market. The possibility of intervention by Korean and Japanese foreign exchange authorities arose as the won-dollar and yen-dollar exchange rates simultaneously fell sharply.

According to the foreign exchange market on the 31st, the won-dollar exchange rate began to plummet from around 10:20 PM the previous evening, falling to 1,419.0 won around 10:44 PM. The downward trend continued, with the rate dropping to 1,418.0 won around 6 AM that morning.

This was the lowest level in approximately nine months since October 20 of last year. However, the exchange rate subsequently rebounded and was trading around the 1,430 won mark as of 9:37 AM.

The yen similarly showed strength during a similar time frame. The yen-dollar exchange rate, which had been trading in the 163 yen range, briefly plunged to the 157 yen range during the previous night's trading session. Although it later rose back to around 160 yen, market attention focused on the sharp appreciation of the yen in a short period.

[Yonhapnews provided]

▲ Possibility of Korean and Japanese authorities' intervention…Weight on market stabilization

Market analysis emerged suggesting that these simultaneous currency gains should not be viewed as mere market trends. In particular, the possibility of intervention by Korean and Japanese foreign exchange authorities was raised given that the yen and won showed strength at nearly the same time.

The Nikkei reported that the Japanese government and Bank of Japan engaged in yen purchases and dollar sales. Observations also emerged that U.S. monetary authorities conducted "rate checks" to monitor market conditions before actual market intervention.

Lee Min-hyuk, an economist at KB Kookmin Bank, analyzed that it is a situation worthy of estimating the possibility of simultaneous market intervention by Korean and Japanese foreign exchange authorities, given that the won-dollar exchange rate fell to the 1,410 won range when the yen strengthened.

Communication between Korean and Japanese foreign exchange authorities has been active recently, according to market participants, lending credence to the possibility that the two countries coordinated to suppress rapid exchange rate fluctuations.

▲ Dollar weakness as a trigger…U.S. factors compound the situation

The dollar weakness originating from the United States, in addition to the possibility of authorities' intervention, was analyzed as having considerable impact on foreign exchange market movements.

With the U.S. Federal Reserve holding its benchmark interest rate steady, the U.S. second quarter economic growth rate fell short of market expectations, putting downward pressure on the dollar. The analysis suggested that as the dollar's value weakened, upward pressure on Asian currencies such as the yen and won intensified simultaneously.

In fact, the dollar index, which reflects the dollar's value against six major currencies, fell below the 100 mark at 99.985. This was the first time in approximately one and a half months since June 17 that the dollar index dropped below 100.

This demonstrated that the direction of the foreign exchange market in recent times is not determined solely by individual countries' monetary policies but is heavily influenced by U.S. interest rates, economic growth prospects, and changes in the dollar's value.

▲ Between exchange rate stability and market intervention…Testing authorities' response

Whether the simultaneous appreciation of the won and yen proves to be a temporary phenomenon has also emerged as a concern. If dollar weakness continues based on U.S. economic trends and the Federal Reserve's monetary policy direction, additional appreciation pressure may emerge on the won and yen.

However, foreign exchange authorities' market intervention carries the burden that while it has the effect of mitigating sharp shifts and volatility, it can distort the market's natural price formation.

Particularly when the won-dollar exchange rate is trading in the 1,400 won range, authorities' response becomes critical given that not only the absolute level of the exchange rate but also the speed of sharp short-term movements can amplify market instability.

Ultimately, the foreign exchange market movements may be the result of international trends of dollar weakness and the market stabilization intentions of Korean and Japanese foreign exchange authorities converging. Going forward, if the phenomenon of the won and yen moving in similar directions repeats, coordination between Korean and Japanese authorities and U.S. responses are expected to emerge as key variables in the foreign exchange market.