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Aggregate demand and aggregate supply model
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A model that explains short run fluctuations in real gdp and the price level
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Aggregate demand curve
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A curve that shows the relationship between the price level and the quantity of real GDP demanded by households, firms, and the govt
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Short run aggregate supply curve
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A curve that shows the relationship in the short run between the price level and the quantity of real gdp supplied by firms
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Why is the aggregate demand curve downward sloping?
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Because a fall in the price level increases the quantity of real GDP demanded
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Wealth effect
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When price level rises, the nominal value of household wealth falls, reducing consumption and vice versa
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Interest rate effect
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When PL rises, households and firm will borrow more money, leading to higher interest rates, which discourages consumption
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International trade effect
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When price level rises relative to other price levels, US goods become more expensive, and reduce consumption of US exports
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Variables that shift the AD curve
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Changes in govt policies, changes in expectations of households and firms, and changes in foreign exports
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Monetary policy
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Actions fed reserve takes to manage money supply and interest rates to pursue macroeconomic policy objectives
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Fiscal policy
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Changes in federal taxes and purchases that are intended to achieve macroeconomic policy objectives
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Long run aggregate supply curve
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A curve that shows the relationship in the long run between the price level and the quantity of real GDP supplied
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Why is the LRAS a vertical line?
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Because changes in the PL do not affect the number of workers, the capital stock or technology, PL in the long run does not affect real GDP
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Why is the SRAS upward sloping?
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Because firms and workers cannot predict the future price level exactly due to sticky contracts, menu costs, and firms are slow to adjust wages
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What does a higher price level normally mean for workers and firms?
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Higher profits, increased supply and higher wages
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What variables shift the SRAS?
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Increases in labor force, technological change, expected changes in future price level, adjustments of workers and firms to errors in past expectations about PL, and supply shocks
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