Which of the Following Is True About the Long-Run Phillips

Multiple Choice

Which of the following is true about the long-run Phillips curve?

A) No event can shift the curve rightward; it can only be shifted leftward.
B) No event can shift the curve leftward; it can only be shifted rightward.
C) No event can shift the curve either rightward or leftward.
D) Only fiscal and monetary policy can shift the curve.
E) Demand-side policy cannot shift the curve.