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Mr. Mayer AP Macroeconomics

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1 Mr. Mayer AP Macroeconomics
Aggregate Supply

2 Aggregate Supply The level of Real GDP (GDPR) that firms will produce at each Price Level (PL)

3 Long-Run v. Short-Run Long-Run Short-Run
Period of time where input prices are completely flexible and adjust to changes in the price-level In the long-run, the level of Real GDP supplied is independent of the price-level Short-Run Period of time where input prices are sticky and do not adjust to changes in the price-level In the short-run, the level of Real GDP supplied is directly related to the price level

4 Long-Run Aggregate Supply (LRAS)
The Long-Run Aggregate Supply or LRAS marks the level of full employment in the economy (analogous to PPC) Because input prices are completely flexible in the long-run, changes in price-level do not change firms’ real profits and therefore do not change firms’ level of output. This means that the LRAS is vertical at the economy’s level of full employment

5 Long-Run Aggregate Supply (LRAS)
Yf GDPR

6 Short-Run Aggregate Supply (SRAS)
Because input prices are sticky in the short-run, the SRAS is upward sloping.This reflects the fact that in the short-run, increases in the price-level increase firm’s profits and create incentives to increase output. As the price-level falls, firm’s profits drop and this creates an incentive to reduce output.

7 Short-Run Aggregate Supply (SRAS)
GDPR

8 Changes in SRAS An increase in SRAS is seen as a shift to the right. SRAS  A decrease in SRAS is seen as a shift to the left. SRAS  The key to understanding shifts in SRAS is per unit cost of production Per-unit production cost = total input cost/total output

9 Changes in SRAS (Increase)
PL SRAS SRAS1 GDPR

10 Changes in SRAS (Decrease)
PL GDPR

11 Determinants of SRAS (all of the following affect unit production cost)
Input Prices Productivity Legal-Institutional Environment

12 Input Prices Domestic Resource Prices Foreign Resource Prices
Wages (75% of all business costs) Cost of capital Raw Materials (commodity prices) Foreign Resource Prices Strong $ = lower foreign resource prices Weak $ = higher foreign resource prices Market Power Monopolies and cartels that control resources control the price of those resources Increases in Resource Prices = SRAS  Decreases in Resource Prices = SRAS 

13 Productivity Productivity = total output/total inputs
More productivity = lower unit production cost = SRAS  Lower productivity = higher unit production cost = SRAS 

14 Legal-Institutional Environment
Taxes and Subsidies Taxes ($ to gov’t) on business increase per unit production cost = SRAS  Subsidies ($ from gov’t) to business reduce per unit production cost = SRAS  Government Regulation Government regulation creates a cost of compliance = SRAS  Deregulation reduces compliance costs = SRAS 

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