The Phillips curve originally appeared to demonstrate a stable trade-off between ination and unemployment. This was later thought to be deficient because... 0 a. The influence on aggregate demand had not been incorporated. O b. It was later recognised that inflation and unemployment were unrelated. O 0. Changes in unemployment had not been incorporated. 0 d. Inationary expectations had not been incorporated. 0 e. The effects of fiscal policy on aggregate demand had not been incorporated