For economists and investors accustomed to staring at charts, the jagged peaks of the Teton mountains possess more than a passing resemblance to financial trend lines. They also form the backdrop to one of the year’s most keenly awaited central-bank speeches: annual reflections by the chair of the Federal Reserve at a conference hall in Jackson Hole, located in the valley below the Teton range. On August 23rd Jerome Powell did not disappoint. He made clear that having raised interest rates as sharply as any of the slopes in the distance, the central bank was now ready to begin the descent.