Surging US Long-Term Treasury Yields and Exchange Rates: The Structural Reasons Behind the Capital Shift from Big Tech to Defensive Stocks
US long-term Treasury yields have hit multi-year highs, driving up exchange rates and pulling down Big Tech stocks. This article provides a deep dive into the market rotation toward defensive stocks with stable cash flows amid rising discount rates.
The Chain Reaction of Macroeconomics: Treasury Yields, Exchange Rates, and the Stock Market
As of August 2026, the central theme in global financial markets is the surge in US long-term Treasury yields. Hitting multi-year highs, the rise in US Treasury yields is more than just a bond market issue; it is triggering higher exchange rates and driving sector rotation across global equities. This article analyzes the structural reasons behind how rising yields lead to a stronger dollar, which in turn causes divergent trends between growth and defensive stocks.
1. Why Surging Treasury Yields Fuel Higher KRW/USD Exchange Rates
US Treasury yields act as a benchmark for global capital flows. An increase in these yields implies a higher risk-free rate of return for dollar-denominated assets.
- Increased Demand for Dollars: Global capital seeking higher interest returns flows into the US bond market, driving up the demand for the US dollar.
- Depreciation of Emerging Market Assets: Emerging market currencies, including the Korean Won, face selling pressure as they are classified as relatively riskier assets. This naturally leads to an increase in the KRW/USD exchange rate (depreciation of the Won).
- Foreign Capital Outflow: The outflow of foreign capital from the domestic stock market acts as a primary catalyst pulling down the KOSPI index.
2. Why Big Tech and Semiconductor Stocks Are Vulnerable to Rising Yields
The recent decline in the stock prices of Samsung Electronics, SK Hynix, and global Big Tech companies is heavily tied to the rise in the discount rate, rather than mere earnings concerns.
A significant portion of the valuation for technology and growth stocks is based on 'future earnings.' When interest rates rise, the discount rate applied to convert these future earnings into present value also increases, reducing the company's current valuation. Furthermore, for Big Tech companies that require massive capital expenditures, such as building AI data centers, rate hikes intuitively mean an increase in the cost of capital, which directly translates to concerns over deteriorating profitability.
3. A Safe Haven for Capital: The Preference for Defensive Stocks
As market volatility increases and valuation pressures on Big Tech mount, institutional funds are rapidly rotating into defensive stocks.
- Consumer Staples and Healthcare: These are sectors where basic consumer demand is maintained even during economic downturns or rate-hiking cycles. They provide stable cash flows and relatively high dividend yields, acting as a safety net for portfolios in a declining market.
- Financials: This is a representative sector that directly benefits from rising interest rates. Expectations of improved net interest margins (NIM) due to higher lending rates support their stock prices.
The current market dynamics suggest that tactical asset allocation focused on 'defensive stocks with high earnings visibility' may remain effective until a definitive stabilization in interest rates is observed.