Commodity markets have spent the past three months performing an extraordinary balancing act. Despite one of the most significant disruptions to global energy flows in decades, the global economy has continued to function remarkably smoothly. After an initial spike, prices for several key commodities have stabilised or even eased. Yet this apparent calm is deceptive. The reason the system has held together is due to governments, producers and consumers drawing down the buffers that normally protect the global economy from disruption. Those buffers…