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Aggregate Supply & Demand

Aggregate Supply & Demand. Lecture 9. The IS-LM Model => AD Curve. C=C ( G, T, i, GDPW ) I = I ( G, T, i, GDPW ) M = M ( G, T, i, GDPW ) X = X ( G, T, i, GDPW ) IS Curve: GDP = C+I+X-M +G = GDP ( G, T, i, GDPW ) (Simplified Money Demand) Md/P=GDP* L ( i) Money Supply=Ms

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Aggregate Supply & Demand

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  1. Aggregate Supply & Demand Lecture 9

  2. The IS-LM Model => AD Curve • C=C ( G, T, i, GDPW ) • I = I ( G, T, i, GDPW ) • M = M ( G, T, i, GDPW ) • X = X ( G, T, i, GDPW ) • IS Curve: GDP = C+I+X-M +G • = GDP ( G, T, i, GDPW ) • (Simplified Money Demand) Md/P=GDP* L ( i) • Money Supply=Ms • Equilibrium: Md=Ms => Ms=P*GDP*L( i), or solving for i => • LM Curve: i = i( Ms/ (P*GDP)) • Aggregate Demand AD: insert LM curve into the IS Curve: • GDP=GDP(G,T,GDPW,P,Ms)

  3. Aggregate Demand • “Demand” curves in economics traditionally refer to relationships between the quantity demanded and the price of the good or service • In macroeconomics, the aggregate demand curve...is nothing more than the intersections of the IS-LM curves for different price levels. Or, it traces the reduced form equation for GDP at different price levels. Therefore, the AD curve shows the equilibrium output associated with each price.

  4. Aggregate Demand • The aggregate demand curve is the intersection of the IS-LM curves for different price levels. It shows the equilibrium output associated with each price. • How do price changes affect IS:goods market? • How do price changes affect LM:money market? • Can you conclude then how they will affect the equilibrium points?

  5. “IS - LM”:Reactions to Higher Prices GDP=GDP(i,G,T,GDPW) i = Interest Rate • i =L( M/p, GDP ) GDP for P1 GDP for P0 If P1>P0 :

  6. Aggregate Demand • The aggregate demand curve is the intersection of the IS-LM curves for different price levels. It shows the equilibrium output associated with each price. P= Price Level GDP = Output / Spending

  7. Aggregate Supply • The aggregate supply curve is the level of domestic output that producers will supply given a price level for their output. P= Price Level GDP = Output / Spending

  8. Aggregate Supply • aggregate supply:domestic output given a price level for domestic output. How will it shift if the international price of oil rises and the domestic output price ( P ) doesn’t? P= Price Level GDP = Output / Spending

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