On a Tuesday in mid-September 2026, the dollar climbed to a two-week high as surging oil prices set off a chain reaction across global markets — lifting Treasury yields, reshaping expectations about Federal Reserve policy, and drawing fresh demand for dollar-denominated assets. It is a familiar rhythm in modern finance: a single commodity's movement becomes a signal, the signal becomes a forecast, and the forecast becomes a price. The market is not predicting the future so much as betting on what it believes central bankers will do next.