10 . Short-run equilibrium and long-run aggregate supply The following graph shows several aggregate demand and aggregate supply curves for an economy whose potential output is $4 trillion. The curves are labelled a, b, c, and d. Three points on the graph are also indicated by grey stars and labelled X, Y, and Z. 160 150 X. 140 130 120 PRICE LEVEL C 110 d 100 80 2 3 5 6 7 8 REAL GDP (Trillions of dollars)d 100 90 80 2 3 4 5 6 7 8 REAL GDP (Trillions of dollars) Identify which curve on the previous graph corresponds to each description in the following table. If the curve described does not appear on the graph, choose Not Shown. Description a b C d Not Shown Short-run aggregate supply (SRAS) when there is an inflationary gap O O O O O Short-run aggregate supply (SRAS) when there is a recessionary gap O O O O O Aggregate demand (AD) O O O O O Short-run aggregate supply (SRAS) when the economy is at long-run equilibrium O O O O O Long-run aggregate supply (LRAS) O O O O O