If the United States is the world’s largest oil producer—in fact, if we are energy independent—then why are we still at the mercy of global events? And how can prices spike instantly when the gasoline in the tank was made from cheaper oil weeks ago? People like easy answers, such as “corporate greed.” That is emotionally satisfying, but it doesn’t tell the full story. What’s happening is a function of global markets, supply chain realities, and predictable patterns in consumer behavior. In fact, much of what we’re seeing is exactly how the system is designed to work. The U.S. leads...