Answer:
a) In simple words, higher level of pessimism would result in lesser aggregate demand. Thus, AD will shift from point AD0 to the point AD1. The fresh short time equilibrium is placed at point B (wherein AD1 is conneting to SRAS0). Longer run accostoming will move SRAS curve from point SRAS0 to the pint SRAS1. Hence, the New longer run equilibrium has been placed at point C.