Global Bond Markets Plummet as Long-Term Borrowing Costs Hit Multi-Decade Highs

As governments around the world face soaring borrowing costs, markets widely believe that 'bond vigilantes' have officially returned, expressing strong protest against government spending expansion and inflationary pressures.

Global Yields Rise in Unison

Sovereign bond yields are rising almost everywhere. This week, the U.S. 30-year Treasury yield reached its highest level since 2007; French borrowing costs hit a new high since 2008; German bund yields stand at 2011 levels. In the UK, the yield on long-term government bonds (gilts) is approaching 6%; Japanese long-term bond yields are also nearing historic highs.

The structural forces driving this yield surge are global. In addition to Middle East conflicts causing energy prices to spike, investors fear that a fragmented world order will make supply shocks and inflationary pressures a permanent feature. Chris Iggo, Chief Investment Officer for Core Investments at AXA Investment Managers, noted that it is difficult to foresee when the total return outlook for long-dated fixed-income assets will improve—unless there is a sudden weakening in economic data or an external shock. 'The latter seems more likely than the former,' he said.

Supply Glut and Shift in Buyer Structure

Government fiscal budget overruns have made bondholders worry that interest rates will remain elevated for longer. At the same time, the market faces supply-side challenges. Besides governments issuing large volumes of debt to cover deficits, tech giants are also issuing long-term corporate bonds to fund artificial intelligence (AI) investments, competing for capital. For example, Alphabet issued 5 billion Australian dollars worth of bonds in Australia.

A more critical change lies in the shift of buyer structure. Anshul Pradhan, Head of U.S. Rates Strategy at Barclays, stated that over the past decade, bond buyers have shifted from 'price-insensitive official institutions' to 'return-sensitive private investors.' This explains the approximately 90 basis point 'term premium' on U.S. 30-year Treasuries.

Election Risks and Market Shifts

The U.S. presidential election has added policy uncertainty. Iggo pointed out that the November election will bring fiscal issues into sharp focus. Entering the election period with mortgage rates still high is far from ideal for the incumbent administration.

Moreover, Japan, once seen as the 'anchor' of global interest rates, is showing signs of loosening. Prashant Newnaha, Senior Asia-Pacific Interest Rate Strategist at TD Securities, believes that the Bank of Japan's (BOJ) reduction in bond-buying programs, combined with inflationary pressure from energy imports, has diminished investor appetite for Japanese government bonds (JGBs). He warned, 'The risk of rising JGB yields is triggering repricing of duration across global bond markets.'

Despite market uncertainties, some experts see opportunities. Kelsey Berro, Portfolio Manager at JPMorgan Asset Management, believes that the current rise in borrowing costs is primarily driven by 'real yields,' not collapsing inflation expectations.

She stated that long-dated bonds now offer better value at current levels, especially in terms of real yields. If risk assets become volatile, bonds could provide stability to investment portfolios.