The yield on South Korea's 30-year government bonds has soared to an all-time high, a trend that cannot be solely attributed to interest rate hikes. Analysts suggest that a combination of global long-term interest rates, inflation uncertainties, and government bond supply pressures are contributing to the increased 'term premium' on long-term bonds.
According to the Financial Investment Association, as of August 19, the yield on 3-year government bonds was 3.798%, 10-year bonds were at 4.337%, and 30-year bonds reached 4.721%. Compared to the Bank of Korea's interest rate hike on July 16, the 3-year yield has decreased by 5 basis points (1 basis point = 0.01 percentage points), while the 10-year yield rose by 4 basis points, and the 30-year yield surged by 25 basis points. The 30-year yield peaked at 4.751% on August 18, marking its highest level since its first issuance in 2012.
This recent rise in interest rates cannot be explained solely by expectations of future rate hikes from the Bank of Korea. If the potential for additional rate increases were the main driver, yields on the 2-3 year bonds, which are sensitive to monetary policy, would also be rising. However, short-term yields have remained stable, while the increase in long-term yields has been pronounced, indicating a phenomenon known as 'bear steepening.' Market observers believe that the influence of term premiums, reflecting global interest rates, inflation, and government bond supply, has become more significant than expectations for domestic rate hikes.
Kim Myung-sil, a researcher at iM Investment & Securities, noted, "A notable characteristic of the recent domestic bond market is that the increase in rates is concentrated in the long-term segment rather than being uniform across all maturities. The bear steepening is more influenced by supply and demand than by policy decisions."
The rise in long-term rates is significantly impacted by trends originating in the United States. The yield on U.S. 30-year Treasury bonds has recently reached its highest level in 19 years. Factors such as the U.S. fiscal burden, increased government bond supply, and inflation uncertainties due to rising international oil prices have led to higher required yields for long-term bond investors. Since domestic long-term bonds are also influenced by global bond yields, it is difficult to avoid the impact of rising U.S. long-term rates.
Domestic supply and demand conditions are also pushing long-term rates higher. While the burden of government bond supply is increasing, the buying strength of long-term investors, such as insurance companies and pension funds, has weakened compared to previous years. In a situation where supply is increasing but demand is insufficient to absorb it, investors are likely to demand higher yields, particularly on ultra-long bonds.
Another factor drawing market attention is fiscal policy. If the budget proposal to be announced at the end of this month includes larger-than-expected fiscal expenditures and government bond issuance, additional upward pressure on long-term rates may occur. In fact, when discussions about supplementary budgets arose in January, the yield on 10-year government bonds rose by 8.8 basis points in a single day, while 20-year and 30-year bonds jumped by over 10 basis points. The market reacted immediately to the potential for increased government bond supply.
As a result, there are speculations that a movement similar to a 'bond vigilante' group may be emerging in South Korea. This term refers to investors who, concerned about fiscal deficits and rising national debt, sell government bonds or demand higher yields, thereby constraining government fiscal expansion through rising market rates. In major countries like the U.S., recent fiscal burdens have also pushed long-term bond yields higher, reigniting discussions about bond vigilantes.
However, it is premature to label the surge in domestic long-term rates as the emergence of a South Korean version of bond vigilantes. The rise in U.S. long-term rates, inflation uncertainties, and changes in the supply and demand for ultra-long bonds are also contributing factors beyond fiscal policy. It is essential to distinguish between a simple increase in bond supply leading to lower prices and higher yields, and investors demanding a separate risk premium due to concerns about fiscal health.
The key will be future developments. If long-term rates continue to spike each time fiscal expansion or increased bond issuance is announced, and if the premium on 10- and 30-year bonds remains higher than that on short-term bonds, it could reinforce the interpretation that the market is sending warning signals to the government regarding fiscal policy.
Kim Chan-hee, a researcher at Shinhan Investment Corp., stated, "Considering the annual issuance plan for long-term bonds, there is a possibility that the issuance of 30-year bonds will increase again starting in September. In the absence of clear fundamental reversal signals or triggers for supply reduction, it is difficult to expect a trend reversal."
* This article has been translated by AI.
Copyright ⓒ Aju Press All rights reserved.