France's brutal bond sell-off is sparking fears of wider financial contagion

• Investors are growing anxious about financial contagion as France's bond market convulses.
• French bond yields have spiked amid concerns about debt, inflation, and political unrest.
• The bond sell-off is spilling over into other nations, sparking fears of a larger event.

A sell-off in the US bond market has shaken investors in the last few months, but traders are also nervously eyeing fixed income turmoil in a major European nation: France.

The country, which has the third largest economy in Europe, is teetering on the edge of a debt crisis, threatening social unrest and political upheaval. Yields on French government bonds have spiked in the last week last week as investors balk at the country's fiscal situation. Broader inflation and political concerns in Europe have sharpened the market's reaction, resulting in a massive sell-off in European bonds that continued through the weekend.

French bonds took the brunt of the selling, and investors are demanding increasingly higher yields to hold the debt compared to Germany's sovereign bonds. The French 10-year bond yield surged to just under 5% last Friday, its highest level since 2002, and the difference between French and German bond yields widened to the most in almost 15 years.

Anxiety that the country's pain could spark wider financial contagion is now growing.

Here's what you need to know:

First, France unveiled its 2027 budget bill last Thursday, drawing investors' attention to the country's debt, which is expected to rise to an all-time high of 119% of GDP this year.

Second, France said it planned to sell a record amount of bonds next year, stoking fears among fixed-income investors that the nation's borrowing is becoming unsustainable.

So-called bond vigilantes have been on the lookout in sovereign debt markets for the last few years as world governments have racked up more debt and ramped up deficit spending. The market's tantrums often send yields higher, which bearish investors hope will force governments to change their approach to fiscal issues. Donald Trump admitted last year that the bond market caused him to ease up on his trade war.

Fourth, inflation is top of mind for investors globally. Eurozone inflation accelerated to 3.8% in September, up from a 3.2% pace the prior month. Hotter inflation makes investors more hesitant to hold onto government debt securities.

Fourth, political instability in Europe is also playing a role. Spain's prime minister, Pedro Sanchez, called for snap elections in November after recent protests about housing affordability. Geopolitical instability also be a reason for investors to sell bonds.

The pain is already being felt in other eurozone nations. Italy's 10-year government bond yield spiked as high as 4.74%, up 18 basis points in the last week. Greece, which has battled fiscal concerns and debt crises for much of the 21st century, saw the yield on its 10-year bond spike as high as 4.57%, also up 18 basis points over the last week.

For investors, the situation has fanned a larger fear of financial contagion.

"When the spread between French and German borrowing costs hits levels last seen in 2012, investors are sending a clear message," Lukman Otunuga, the head of market research at the broker FXTM, wrote in a note on Monday, adding that "caution could spill over" into the US market.

US Treasury yields continued their steady march higher on Monday as investors waited on Fed minutes due midweek. The 10-yea bond rose another 5 basis points to 5.33%, the highest since 2002.

"Contagion risk is back in Europe," top economist Mohamed El-Erian wrote of France's bond sell-off on Monday. "This week provided undeniable, real-time evidence of a dynamic I have warned about: the growing spillover of interest rate risk into credit and spread risk," he added.

Higher rates have the potential to spark a cascade of negative effects across markets. Higher yields pressure stock valuations. They also influence borrowing costs across the economy, and make government bonds a competitive destination for investors, which risks drawing funds away from other areas that have relied on the debt markets, such as AI infrastructure.

Some of the damage from the global bond sell-off has already spread to the currency and stock markets. The euro was valued at 1.12 dollars on Monday, down 2% over the last month and the lowest against the greenback in 17 months.

European stocks were broadly impacted as investors digested the latest spike in yields, with France's benchmark CAC 40 index down 3% over the last five trading days.

"France stands out as spreads have moved to crisis level," strategists at Barclays wrote of the global bond sell-off last week. "The long end remains under pressure."

"The French situation is perilous. It is hard to believe that 5 years ago France 10-year borrowing rates were effectively zero, and today are fast approaching 5%," Stephen Coltman, the head of macro at the digital asset firm 21shares, wrote in a note. "With debt to GDP well in excess of 100% the shock to the public finances as the existing stock of debt rolls off and is refinanced will be substantial."

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