Australian borrowing costs hit multi-year high amid global debt concerns

The Australian share market is poised for a fall as global borrowing costs surge to their highest levels in decades. Concerns over mounting government debt, persistent inflation, and geopolitical instability are driving up yields on government bonds worldwide.

Australia's own 10-year bond yield has climbed to 5.07%, reflecting increased lender demands for compensation due to perceived higher risks over the next decade. This trend mirrors similar movements in the United States, Japan, and Germany, where long-term borrowing costs have reached multi-decade peaks.

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Bond markets are entering an era where the inflation and interest rate outlook is more uncertain as US President Donald Trump's policies, from tariffs to war, upend the global order.

Several factors are contributing to this global financial tightening. The protracted U.S.-Iran war is pushing oil prices above $90 per barrel, exacerbating inflation and hindering economic growth. Additionally, significant borrowing by technology companies for artificial intelligence infrastructure development is competing with demand for government bonds, further pressuring yields.

Analysts note that politicians' spending habits are becoming increasingly "problematic." In the U.S., debt levels are approaching $40 trillion, while other developed nations also face unsustainable debt piles. This environment of rising interest rates and increased borrowing costs impacts not only governments but also businesses and households, potentially reducing investors' tolerance for riskier assets like shares.

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Debt levels in developed countries are reaching thresholds that look increasingly unsustainable, with the US debt pile nearing $US40 trillion.