"A sustained $10 increase in oil prices is expected to increase inflation by 0.4% and lower GDP by 0.4%": Apollo Global Management 's ( APO -4.34%) chief economist Torston Slok says oil is fueling U.S. stagflation fears, adding to the effect expected from import tariffs.

That sent the yield on the 10-year Treasury up to 4.43% from 4.36% late Thursday. Higher yields can tug down on prices for stocks and other investments, while making it more expensive for U.S. companies and households to borrow money.

Australians could see petrol prices rise as high as $2.20 a litre, as analysts warn the spike in oil prices fuelled by the Israel-Iran conflict will flow "directly to the pump". They fear a prolonged conflict could plunge the world into a global energy crisis that could last years rather than months,

A sustained rise in the price of crude oil, which jumped sharply after Israel attacked Iran, could hurt consumers and President Trump’s efforts to bring down energy costs.

Despite high inflation expectations, price pressures have steadily cooled, with May’s CPI at just 2.4%. This suggests public sentiment may be overreacting to tariff headlines.

The Federal Reserve is widely expected to hold interest rates steady next week, with investors focused on new central bank projections that will show how much weight policymakers are putting on recent soft data and how much risk they attach to unresolved trade and budget issues and an intensifying conflict in the Middle East.