Explain why the short-run aggregate supply curve might be fairly flat in the Keynesian zone of the AS curve. How might we tell if we are in the Keynesian zone of the AS? Explain why the short-run aggregate supply curve might be vertical in the neoclassical zone of the AS curve. How might we tell if we are in the neoclassical zone of the AS? Why might it be important for policymakers to know which zone of the AS curve the economy is in?