Once again, the price of oil has become a messenger of deeper anxieties — and global bond markets are listening. As energy costs climb, inflation fears that many hoped had been tamed are reasserting themselves, pushing the 10-year Treasury yield toward 5% and forcing investors worldwide to reckon with the possibility that higher interest rates are not a passing condition but a new normal. This is a moment that tests the assumptions built into nearly every corner of the financial world, from the mortgage on a family home to the long-term calculations of pension funds.