CAS EC 202 Lecture Notes - Lecture 10: Aggregate Supply, Aggregate Demand, Demand Curve

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Time horizons in macroeconomics: long run, prices are flexible, respond to changes in supply or demand, short run, many prices are sticky at a predetermined level, the economy behaves much differenly when prices are sticky. When prices are sticky : output and employment also depend on demand, which is affected by, fiscal policy (g and t, monetary policy (m, other factors, like exogenous changes in c or i. The quantity equation as aggregate demand: from chapter 4, recall the quantity equation: m*v = p*y, for given values of m and v, this equation implies that an inverse relationship between. Aggregate supply in the long run: recall from ch. 3: In the long run, this raises the price level, but leaves output the same: an increase in m shifts ad to the right. In the short run when prices are sticky, an increase in aggregate demand causes output to rise.

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