If the Long-Run Aggregate Supply Curve Is Vertical

Multiple Choice

If the long-run aggregate supply curve is vertical,

A) the economy stays at the natural rate of inflation in the long run.
B) the short-run Phillips curve must be vertical.
C) unemployment and inflation are positively related in the long run.
D) the trade-off between unemployment and inflation cannot be permanent.
E) any changes in the unemployment rate will be permanent.