Global bond markets came under renewed pressure this week as investors reassessed the outlook for inflation and interest rates, with crude oil prices remaining above $100 per barrel.

The latest move was particularly pronounced in US Treasuries. The 10-year US Treasury yield rose to around 5.1%, reaching its highest levels in years, after stronger-than-expected US economic data reinforced expectations that inflationary pressures may remain persistent. Markets have also increased the probability of another Federal Reserve rate hike in October.

Oil adds to the inflation problem

The key catalyst has been the renewed strength in energy prices. Brent crude has remained above $100 per barrel, trading around $102 -104, as uncertainty surrounding the Middle East and limited progress in US-Iran discussions continue to affect the oil market.

Higher oil prices create a difficult environment for central banks. Energy costs feed directly into headline inflation and can also raise transportation, production and input costs across the broader economy. This increases the risk that interest rates will need to remain higher for longer, even if economic growth begins to slow.

The sell-off is becoming global

The pressure is no longer confined to the US. Government bonds in Europe and Asia have also experienced significant selling. Japan has been particularly notable, with the 10-year Japanese government bond yield rising to around 3.08%, its highest level since 1996. European government bonds also sold off sharply earlier in the week.

The combination of higher oil prices, stronger economic activity and rising government borrowing costs is creating a challenging backdrop for fixed income markets. Higher yields mean lower bond prices in the short term, while governments also face increased financing costs.

What investors are watching

For financial markets, the key question is whether the current inflation shock remains primarily an energy-driven phenomenon or becomes more persistent across the wider economy.

Investors will be watching closely:

•Brent crude: whether oil remains sustainably above $100;
•US 10-year Treasury yields: particularly whether yields remain above 5%;
•Inflation expectations: especially whether higher energy prices begin feeding into core inflation;
•Central-bank expectations: including the probability of further Fed and ECB tightening;
•Economic activity: whether higher borrowing costs eventually begin to weaken growth.

For investors, the current environment highlights the importance of duration management and diversification within fixed income portfolios. A prolonged combination of higher inflation and higher yields could continue to create volatility across government bonds, while a subsequent slowdown in economic activity could eventually provide support for high-quality fixed income.

For now, however, the message from markets is clear: oil above $100 and resilient economic data are making it increasingly difficult for investors to price an imminent return to lower interest rates.