On a Tuesday in mid-September 2026, Wall Street offered a study in divergence: the artificial intelligence stocks that had carried markets through the summer faltered, while broader indices held their footing. Oil prices surged and then quietly surrendered their gains, leaving energy markets where they began. The day's action was less a crisis than a question — whether the retreat in AI equities marks a natural pause after a long ascent, or the first tremor of a deeper reassessment of how much the future is worth today.