A potential new global interest-rate tightening cycle is emerging as the Iran war pushes oil, gas, fuel and borrowing costs higher, increasing inflation and affordability risks despite resilient growth. The Bank of Japan raised rates to a 31-year high on Friday after a Federal Reserve increase two days earlier and a European Central Bank move the previous week, while the Bank of England held rates but warned that prolonged conflict could require further action. The yen continued weakening against the U.S. dollar despite the BOJ's tighter policy, prompting debate over whether larger-scale buybacks may be needed to stabilize the currency.