Joint Currency Interventions by Japan and South Korea
In a rare move, both Japan and South Korea sold US dollars in the open market last night, marking a significant intervention not seen in recent modern history. Japan engaged in its first intervention in three months, purchasing yen and offloading dollars during the New York trading session, which resulted in a dramatic 2.4% drop in the USD/JPY exchange rate—the largest single-day decline since January 2023. Meanwhile, South Korea’s actions led to a 2% increase in the won, bringing it to a nine-month high.
Currency Crisis: Why Now?
The desperate measures come as both nations grapple with steep declines in their currencies. The yen recently hit a 40-year low, falling below 163, compounded by rising oil prices due to geopolitical tensions from the Iran war, exacerbating import costs. South Korea’s won was at a staggering 17-year low of 1,561 per dollar just last month. These moves are not merely reactive but indicative of a broader trend of currency depreciation affecting global markets.
US Involvement: Rate Checks and Psychological Support
Significantly, reports from Nikkei suggest that US authorities conducted rate checks on the yen, a precursor to market interventions. Such checks typically involve central banks contacting financial dealers for exchange rate quotes, indicating potential intervention. While this does not confirm that the US government sold dollars directly, it signals a coordinated effort that could lend support to these interventions. Japan’s top currency official, Atsushi Mimura, acknowledged that they are receiving backing from the US beyond mere psychological support, which may include these rate checks.
Historical Context: Why Coordination Matters
Historically, Japan’s solo interventions in its currency have often failed to achieve lasting stabilization. In 2022 and 2024, Japan’s efforts resulted in temporary relief but ultimately led to new lows for the yen. This year alone, Japan has spent a staggering 11.7 trillion yen ($73 billion) on currency interventions, but the yen continues to trend downwards. Coordinated actions, such as those seen in the past with the US or G7, have been more successful; the 1985 Plaza Accord is a notable example where the dollar fell nearly 50% over two years following joint actions.
India’s Struggles: A Parallel Narrative
Japan and South Korea are not alone in their currency troubles. India has been grappling with similar challenges, reportedly selling around $7 billion in a single day last week as part of its defense against falling rupee values. In recent months, India’s net currency sales reached $9.76 billion in March and $53 billion over the fiscal year. Despite these efforts, the rupee remains down almost 6% this year, highlighting the widespread challenges facing emerging market currencies.
Bank of Japan’s Rate Decisions Amid Inflation Pressures
The Bank of Japan (BOJ) has maintained its interest rate at 1% despite projections of inflation running at 2.5% for the year. This decision reflects the government’s concerns over the increased debt servicing costs associated with rising rates. On the day of the BOJ’s decision, the yen fell back above 160, again illustrating the market’s sensitivity to both policy decisions and external economic pressures.
What’s Next for Currency Markets?
The focus now shifts to the potential for future US involvement and coordinated interventions. Market participants will be watching closely for further rate checks and comments from US Treasury officials regarding the yen’s valuation. The next significant figure to observe will be any shift in the USD/JPY exchange rate and the potential for coordinated actions that could stabilize these currencies. A decisive move from the US could alter the dynamics significantly, especially given the historical context of past interventions.
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