Global Bond Yields Surge to Multi-Decade Highs Amid Inflation Fears

Global government bond yields have surged to their highest levels in decades this week, sparking investor concerns about a spillover into stock markets. The MOVE index, which tracks expected bond market volatility, jumped 19% this week, the largest increase since March and the second highest since April 2025, when former US President Donald Trump's tariff plans rattled markets. Governments issue bonds to raise funds, and their attractiveness, influenced by factors like inflation or war fears, affects their prices and yields. Higher yields increase borrowing costs for mortgages, car loans, and other consumer credit. In the US, the average 30-year fixed mortgage rate recently surpassed 7%, a two-year high, directly linked to the 10-year Treasury yield. Rising yields also increase government debt servicing costs. Bond yields have been climbing since hitting below 0.5% in 2020 post-COVID, accelerating since late February due to the war with Iran, which boosted oil prices and inflation worries. Despite the US Treasury's efforts to curb yields through increased buybacks, the 30-year US Treasury yield reached 5.53% on Thursday, its highest since 2004. The 10-year US Treasury yield hit 5.18% this week, a level not seen since 2007, up from 3.97% before the US and Israel attacked Iran. Similar trends are seen globally, with Japan's 10-year yield at 3.08% (highest since 1996) and Germany's at 3.6% (highest in 17 years). The surge in yields and volatile oil prices, up about 15% this month due to the Iran conflict, are increasing expectations of global interest rate hikes to combat inflation, further pushing up bond yields. The correlation between oil prices and the US 10-year Treasury yield has reached a 35-year high. Analysts note that sustained high oil prices risk spreading inflation throughout the economy, pressuring central banks like the Federal Reserve to raise rates. While inflation fears and oil prices are primary drivers, the strength of the US economy also contributes to rising yields, suggesting the Fed may be comfortable with higher rates. The Federal Reserve raised its benchmark rate to 4% last week, following a similar move by the European Central Bank earlier this month. This uncertainty is impacting stock markets, with the S&P 500 down slightly from its peak. Most sectors within the S&P 500 are declining, particularly utilities, which are sensitive to interest rates. The equal-weighted S&P 500 has fallen over 5% since its August peak.