Korean bond rates most sensitive to changing US yields in emerging Asian markets

Korean interest rates are highly sensitive to U.S. yield movements, a new Bank of Korea study showed Sunday. The study says markets often price in an expected BOK response before the central bank acts, helping drive the close link between Korean and U.S. long-term yields. It also found global inflation shocks accounted for 41 percent of the co-movement, and that the link intensified after the 2008 financial crisis and the 2021 inflation shock. BOK researcher Lee Hyung-suk said steadier communication could help moderate the expectations channel.

A Bloomberg analysis earlier this year found Korean government bonds were the most sensitive among emerging Asian markets to shifts in the U.S. Treasury yield curve.

The BOK researchers said global inflation shocks accounted for 41 percent of the co-movement between Korean and U.S. rates, including both direction and volatility.

The link between Korean and U.S. yields strengthened sharply after the 2008 global financial crisis and again during the global inflation shock that began in 2021.

Published Sep 20, 2026 4:12 pm KST

Investors expect BOK response to follow US rate moves: study

An employee arranges U.S. dollar banknotes at Hana Bank's counterfeit detection center in central Seoul, March 23. Korea Times photo by Ha Sang-yoon

Korean interest rates are highly sensitive to movements in U.S. yields as markets anticipate a quick response by the Bank of Korea (BOK), pricing that expectation into Korean rates before the central bank actually makes a move, a new BOK study showed Sunday.

The finding helps explain why Korean bond yields tend to move closely with their U.S. counterparts even when the two economies seem to be heading in different directions.

That sensitivity has become increasingly pronounced over the past two decades. A Bloomberg analysis earlier this year found Korean government bonds to be the most sensitive among emerging Asian markets to shifts in the U.S. Treasury yield curve.

The BOK researchers found that global inflation shocks were the single largest contributor, accounting for 41 percent of the co-movement, both in the direction and the level of volatility. The link strengthened sharply after the 2008 global financial crisis and again during the global inflation shock that began in 2021.

This can make it harder for the BOK to calibrate monetary policy solely based on economic conditions at home. Higher long-term yields can also feed through to borrowing costs for domestic households and businesses.

What is more revealing is how those external shocks are transmitted into Korean interest rates. The answer, the study suggests, lies largely in market expectations about monetary policy.

When global inflation pushes U.S. rates higher, markets anticipate a similar response from the BOK and price that move into Korean yields before the central bank actually changes its policy rate.

In other words, investors’ expectations for the central bank’s future policy path play a pivotal role in transmitting external shocks to Korean long-term yields, rather than their sudden reassessment of the riskiness of Korean bonds.

That distinction matters for the central bank. If markets are already pricing in a domestic policy response to movements in U.S. rates, the BOK may be able to moderate some of that spillover through clearer communication about its policy outlook.

"Our suggestion is not to insulate Korean rates from global shocks altogether. Rather, more stable communication could help manage the expectations channel and moderate the degree to which external moves are transmitted into Korean rates," said Lee Hyung-suk, an associate research fellow at the BOK's Economic Research Institute.

Lee stressed communication with financial markets as a way to manage the expectations channel and, in turn, moderate the degree to which Korean and U.S. long-term yields move together.

韩国央行周日发布的一项新研究显示，韩国利率对美国国债收益率的变动高度敏感。该研究指出，市场往往会在韩国央行采取行动之前就将预期反应计入价格，从而加剧了韩美长期国债收益率之间的紧密联系。研究还发现，全球通胀冲击占韩美国债收益率联动的41%，且这种联系在2008年金融危机和2021年通胀冲击后进一步增强。韩国央行研究员李亨硕表示，更稳定的沟通有助于缓和这种预期效应。

今年早些时候彭博社的一项分析发现，在亚洲新兴市场中，韩国政府债券对美国国债收益率曲线的变化最为敏感。

韩国央行研究人员表示，全球通胀冲击占韩国和美国利率联动变动的 41%，包括利率方向和波动性。

2008 年全球金融危机后，韩国和美国国债收益率之间的联系急剧加强；2021 年开始的全球通胀冲击期间，这种联系再次加强。

发布于2026年9月20日下午4:12（韩国标准时间）

投资者预期韩国央行将跟随美国利率走势：研究

3月23日，一名员工在首尔市中心韩亚银行的假钞检测中心整理美元钞票。（韩国时报 河相允 摄）

韩国央行周日发布的一项新研究显示，由于市场预期韩国央行会迅速做出反应，因此韩国利率对美国收益率的变动高度敏感，并在央行实际采取行动之前，将这种预期反映在韩国利率中。

这一发现有助于解释为什么即使韩国和美国的经济似乎朝着不同的方向发展，韩国债券收益率也往往会与美国债券收益率密切相关。

过去二十年来，这种敏感性变得日益明显。彭博社今年早些时候的一项分析发现，在亚洲新兴市场中，韩国政府债券对美国国债收益率曲线的变化最为敏感。

韩国央行的研究人员发现，全球通胀冲击是最大的单一影响因素，占共同波动幅度（包括方向和波动程度）的41%。这种关联在2008年全球金融危机后显著增强，并在2021年开始的全球通胀冲击期间再次增强。

这可能会使韩国央行更难仅根据国内经济状况来调整货币政策。长期收益率上升也可能推高国内家庭和企业的借贷成本。

更具启发性的是，这些外部冲击是如何传导至韩国利率的。研究表明，答案主要在于市场对货币政策的预期。

当全球通胀推高美国利率时，市场预期韩国央行也会做出类似反应，价格会在央行实际改变政策利率之前就反映在韩国国债收益率上。

换句话说，投资者对央行未来政策路径的预期在将外部冲击传递到韩国长期收益率方面起着关键作用，而不是他们对韩国债券风险的突然重新评估。

这一区别对央行至关重要。如果市场已经将国内政策对美国利率变动的应对措施纳入考量，那么韩国央行可以通过更清晰地传达其政策前景，来缓解部分溢出效应。

韩国央行经济研究所副研究员李亨硕表示：“我们的建议并非完全使韩国利率免受全球冲击的影响。相反，更稳定的沟通有助于管理预期渠道，并缓和外部因素传导至韩国利率的程度。”

李强调与金融市场沟通是管理预期渠道的一种方式，进而可以缓和韩国和美国长期收益率的同步变动程度。