OPEC crude output has fallen to its lowest level in decades amid the U.S. blockade of Iran, shifting the story from U.S. inventory tightness to a broader supply-side constraint within the producer group. The development points to weaker OPEC cohesion and reduced output, conditions that may make oil prices more volatile and complicate efforts to manage inflation and maintain global economic stability. Lower production from a major supplier bloc can leave the market more exposed to shocks, with potential spillovers into transport costs, industrial input prices and wider investor sentiment.