US borrowing costs hit highest level since 2007

The effective interest rate on U.S. government bonds, known as the 10-year Treasury yield, rose to 5.04% in 2021, marking the highest level since 2007. This increase came as oil prices jumped, sparking concerns about inflation. The rise in yields has been global, driven by worries that soaring oil prices due to tensions between the U.S. and Iran would lead to higher interest rates.

The U.S. government has been purchasing bonds to try and lower the Treasury yield, a move Treasury Secretary Scott Bessent described as successful. Meanwhile, global benchmark oil prices spiked to over $109 a barrel, up from around $86 at the end of August, following renewed doubts about Saudi Arabia's ability to export oil amid rising regional tensions.

Investors are anticipating Federal Reserve Chair Kevin Warsh to raise interest rates to curb inflation caused by higher oil prices. However, President Donald Trump opposes a rate hike, preferring lower rates to stimulate the economy. He had previously clashed with Warsh's predecessor, Jerome Powell, over Powell's decision not to cut rates.

Higher interest rates and inflation typically push up the yields investors demand for government borrowing. Bond yields can also signal investors' confidence in a government, with higher yields indicating less confidence. Competition for debt among artificial intelligence firms is also contributing to higher yields. Tech giants are borrowing vast sums to build massive data centers, driving up interest rates on their debt, which in turn raises government bond yields.

Carol Schleif, chief market strategist at BMO Wealth Management, noted that bond markets had been signaling for weeks that higher interest rates might be necessary. While borrowing costs have been rising steadily this year, not abruptly, Schleif suggested rates could stay elevated if geopolitical tensions and high energy prices continue to dominate headlines.