The global bond market is experiencing turbulence, leading to a sharp rise in South Korea's long-term interest rates. Recently, the yield on the U.S. 30-year Treasury bond surpassed 5.3%, reaching its highest level since 2007, while long-term rates in Japan and major European countries have also hit multi-decade highs. This surge is attributed to heightened inflation concerns due to instability in the Middle East and rising international oil prices, compounded by worries over fiscal deficits and increased government bond issuance in major economies.
South Korea is not immune to these trends. On August 18, the yield on the 10-year government bond rose to 4.382%, an increase of 0.069 percentage points in just one day, while the 30-year bond yield soared to 4.751%, setting a new record. In contrast, the yield on the 3-year bond, which is closely tied to the base rate, stands at 3.847%, highlighting the particularly pronounced rise in long-term rates. This indicates that the increase in long-term rates in the U.S. and other global markets is quickly transferring to South Korea's bond market.
The issue is that rising government bond rates do not only affect bond investors. These rates serve as a benchmark for private financing costs, influencing the yields on corporate bonds and bank loans. On August 18, the yield on AA-rated corporate bonds for three years also increased to 4.542%. If high rates persist, companies will face higher costs when issuing corporate bonds or borrowing from banks, potentially leading to delays in capital investment and new projects. This is particularly concerning for heavily indebted companies and real estate project financing.
Households are similarly affected. As banks' funding costs rise, there will be upward pressure on loan rates, including mortgage rates. With significant household debt, an increase in interest burdens will likely lead households to cut back on consumption first. If the government attempts to stimulate the economy by injecting money but market interest rates offset these efforts, it could hinder economic recovery. This is why the rise in long-term interest rates cannot be viewed solely as a financial market issue.
The Bank of Korea's challenges are also deepening. Last month, the central bank raised the base rate from 2.50% to 2.75%. Even if adjustments to the base rate are made based on future economic conditions, there is a possibility that domestic market rates will not follow suit if global long-term rates remain high. Conversely, maintaining a tight monetary policy for an extended period to stabilize market rates could further increase the interest burden on households and businesses. The rise in global long-term rates could limit the central bank's policy options.
Government finances are not exempt from these pressures. An increase in government bond rates means that the interest burden on new debt or refinancing existing bonds will rise. If the government excessively relies on bond issuance to expand fiscal spending, the increased supply of bonds could further push up long-term rates, creating a vicious cycle. Concerns about fiscal deficits and rising national debt are also at the root of the recent surge in long-term rates in major economies. The government should not end up increasing private financing costs while attempting to stimulate the economy through fiscal measures.
The direction for response is clear. The government should spend on necessary fiscal measures while reducing non-essential expenditures and maintaining a long-term national debt management plan to uphold trust in public finances. Financial authorities should closely monitor whether the rise in market rates is leading to defaults among vulnerable borrowers, self-employed individuals, struggling companies, and project financing.
Long-term interest rates represent the cost of money that the economy must bear over an extended period. When this cost rises sharply, it simultaneously pressures household consumption, business investment, and government fiscal capacity. While global rates are beyond our control, the resilience of our economy to withstand these shocks is in our hands. It is time to reduce debt and enhance trust in public finances. We must not take the warnings from the bond market lightly.
* This article has been translated by AI.
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