Bond markets are reasserting their role as enforcers of fiscal discipline, with investors demanding higher yields from governments amid a surge in borrowing. This shift, dubbed "bond market activism," signifies a departure from the era of low rates and quantitative easing post-global financial crisis, when central banks were dominant buyers. High borrowing during the COVID-19 pandemic has significantly increased debt burdens, with net government debt expected to exceed 100% of GDP in the US and France, and approach that level in the UK this year, according to IMF forecasts. Yearly deficits are also widening, projected to surpass 7% of GDP in the US in 2025 and 5-5.5% in France for the same year.
This renewed investor scrutiny is evident in several key markets. The UK's heavy borrowing budget led to a sell-off in the gilt market, pushing the 10-year yield to its highest since 2008. The additional yield demanded for UK debt compared to German 10-year bonds rose above 2.3 percentage points, the largest premium since 1990. France's political crisis has driven its borrowing costs above Greece's, with its spread over Germany reaching 0.9 percentage points, the highest since the Eurozone debt crisis. In the US, 10-year Treasury yields jumped from 3.6% in September to nearly 4.7% due to concerns over future borrowing and tax cuts.
This market behavior comes despite central banks beginning to lower interest rates, indicating that bond yields are being driven by factors beyond inflation and monetary policy, particularly the scale of government issuance. Analysts liken this to the return of "bond vigilantes" from the 1990s, who pressured governments into fiscal changes. The absence of a "price-insensitive buyer," like central banks and, to some extent, China selling off foreign debt, means bond markets are now a more controlling force. The Bank for International Settlements warned in December that rising debt is a significant threat to the global economy, and higher borrowing costs reflect markets' realization that they will have to absorb more debt. Moody's downgraded France's credit rating, citing a negative feedback loop between higher deficits, debt, and financing costs, while investors are warning that the UK's Chancellor Rachel Reeves may breach fiscal rules.
