Short-Run Aggregate Supply (SRAS)

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AP Macroeconomics › Short-Run Aggregate Supply (SRAS)

Questions 1 - 10
1

Based on the short-run aggregate supply curve shown, suppose a pandemic reduces labor availability and disrupts supply chains, raising per-unit costs while nominal wages and many prices do not adjust quickly in the short run. Which option correctly identifies the SRAS determinant and the short-run direction of changes in the price level and real GDP?

An increase in aggregate demand shifts SRAS right, raising the price level and raising real GDP in the short run.

A negative supply shock shifts SRAS left, raising the price level and lowering real GDP in the short run.

A fall in nominal wages shifts SRAS left, raising the price level and lowering real GDP in the short run.

A positive productivity shock shifts SRAS right, raising the price level and raising real GDP in the short run.

A negative supply shock shifts SRAS right, lowering the price level and raising real GDP in the short run.

Explanation

SRAS shows how much output firms produce at different price levels when some costs are sticky in the short run. A pandemic that reduces labor availability and disrupts supply chains is a classic negative supply shock - it directly impairs firms' ability to produce by limiting key inputs and raising per-unit costs. With sticky wages and prices, firms cannot immediately adjust all costs, leading to higher production costs per unit of output. This shifts SRAS leftward from SRAS₁ to SRAS₂, as firms produce less at any given price level. The leftward shift causes the price level to rise and real GDP to fall - a stagflationary outcome. Students often confuse pandemic effects with demand shocks, but labor shortages and supply chain issues directly affect production capacity. The strategy: events that reduce input availability or raise input costs shift SRAS left, causing higher prices and lower output.

2

Based on the short-run aggregate supply curve shown, firms adopt a new production technology that increases labor productivity, reducing per-unit costs while nominal wages adjust slowly in the short run. Which of the following best describes the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?

SRAS shifts right, causing the price level to rise and real GDP to rise in the short run.

SRAS shifts right, causing the price level to fall and real GDP to rise in the short run.

There is a movement along SRAS because productivity changes only affect aggregate demand.

SRAS shifts left, causing the price level to fall and real GDP to rise in the short run.

SRAS shifts left, causing the price level to rise and real GDP to fall in the short run.

Explanation

SRAS represents the relationship between price level and real GDP when input prices adjust slowly. When firms adopt new technology that increases labor productivity, workers can produce more output per hour, effectively reducing the per-unit cost of production. With sticky nominal wages in the short run, firms benefit from lower costs per unit of output produced. This positive productivity shock shifts SRAS rightward from SRAS₁ to SRAS₂, as firms are willing to produce more at any given price level. The rightward shift leads to a lower price level and higher real GDP - an ideal economic outcome. A common error is thinking productivity only affects long-run supply, but productivity improvements immediately reduce costs and shift SRAS. The key principle: positive productivity shocks (technological improvements) shift SRAS right, lowering prices and increasing output.

3

Based on the short-run aggregate supply curve shown, suppose firms experience a sustained decrease in the price of key commodities used in production, lowering per-unit input costs while wages and some prices remain sticky in the short run. Which statement best describes the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?

SRAS shifts left, so the price level falls and real GDP rises in the short run.

There is a movement along SRAS because lower input prices increase aggregate demand in the short run.

SRAS shifts right, so the price level rises and real GDP falls in the short run.

SRAS shifts right, so the price level falls and real GDP rises in the short run.

SRAS shifts left, so the price level rises and real GDP falls in the short run.

Explanation

SRAS represents the relationship between price level and real GDP when input prices adjust slowly. When key commodity prices fall sustainably, this directly reduces firms' input costs for materials used in production. With sticky wages and some sticky prices, firms benefit from lower per-unit production costs and can profitably increase output at any given price level. This positive cost shock shifts SRAS rightward from SRAS₁ to SRAS₂. The rightward shift results in a lower price level and higher real GDP, as firms expand production and competition drives prices down. A common error is thinking lower input prices affect demand; they actually change firms' cost structure and shift SRAS. The key principle: lower input costs (commodities, energy, materials) shift SRAS right, leading to lower prices and higher output in the short run.

4

A spike in natural gas prices increases heating and electricity costs for firms. In the short run, many product prices do not adjust immediately. Based on the short-run aggregate supply curve shown, which outcome is most consistent with the shift from $SRAS_1$ to $SRAS_2$?

Lower price level and higher real GDP because SRAS shifts right when input prices rise.

No change in price level or real GDP because wages adjust instantly to input price changes.

Lower price level and lower real GDP because SRAS shifts left when input prices rise.

Higher price level and higher real GDP because SRAS shifts right when input prices rise.

Higher price level and lower real GDP because SRAS shifts left when input prices rise.

Explanation

The short-run aggregate supply (SRAS) curve represents how much output firms produce at various price levels when some costs are sticky. A spike in natural gas prices directly increases firms' input costs for heating and electricity—essential expenses for most businesses. When product prices don't adjust immediately in the short run, firms face squeezed profit margins as their costs rise faster than their revenues. The graph shows SRAS shifting leftward from SRAS₁ to SRAS₂, indicating that higher production costs make firms willing to supply less output at each price level. This leftward shift results in a new equilibrium with a higher price level and lower real GDP—the stagflation outcome. A key misconception is thinking input price changes affect only specific industries; remember that energy costs affect nearly all firms, so energy price spikes shift the entire SRAS curve left.

5

A pandemic causes repeated worker absences and intermittent shutdowns, raising per-unit costs for firms in the short run while many wages and prices remain sticky. Based on the short-run aggregate supply curve shown, which statement correctly describes the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?

No change in the price level and no change in real GDP because the economy is always in the long run.

An increase in the price level and a decrease in real GDP caused by a leftward shift of SRAS from a negative supply shock.

A decrease in the price level and a decrease in real GDP caused by a leftward shift of SRAS from higher productivity.

A decrease in the price level and an increase in real GDP caused by a rightward shift of SRAS from a negative supply shock.

An increase in the price level and an increase in real GDP caused by a rightward shift of SRAS from higher nominal wages.

Explanation

The short-run aggregate supply (SRAS) curve shows the quantity of output firms will produce at different price levels when wages and many prices are sticky. A pandemic causing worker absences and shutdowns is a negative supply shock—it reduces firms' ability to produce efficiently, raising per-unit costs even when nominal wages don't change. With sticky wages and prices, firms cannot immediately adjust all costs and prices to this new reality. The graph depicts SRAS shifting leftward from SRAS₁ to SRAS₂, meaning firms produce less at every price level due to higher costs and reduced productivity. This leftward shift results in stagflation: a higher price level and lower real GDP simultaneously. A key misconception is thinking the economy instantly adjusts to long-run equilibrium; in reality, sticky prices create short-run effects where cost increases shift SRAS left, causing both inflation and reduced output.

6

Firms adopt new logistics software that allows the same workforce and capital to produce more output per hour. Nominal wages do not immediately change. Based on the short-run aggregate supply curve shown, which option best explains the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?

An increase in the price level and a decrease in real GDP caused by a leftward shift of SRAS due to higher productivity.

A decrease in the price level and an increase in real GDP caused by a rightward shift of SRAS due to higher productivity.

No change in the price level and no change in real GDP because productivity changes shift only aggregate demand.

An increase in the price level and an increase in real GDP caused by a rightward shift of SRAS due to higher input prices.

A decrease in the price level and a decrease in real GDP caused by a leftward shift of SRAS due to higher productivity.

Explanation

The short-run aggregate supply (SRAS) curve represents the relationship between price levels and real GDP when nominal wages and some other input prices are sticky. When firms adopt new logistics software that increases productivity, workers can produce more output per hour without any change in nominal wages. This effectively reduces the per-unit cost of production—firms get more output from the same inputs. The graph shows SRAS shifting rightward from SRAS₁ to SRAS₂, indicating firms are willing to supply more output at each price level. This rightward shift leads to a new equilibrium with a lower price level and higher real GDP—the opposite of stagflation. Students often confuse productivity improvements with cost increases; remember that anything reducing per-unit costs (like higher productivity) shifts SRAS right, while anything increasing per-unit costs shifts SRAS left.

7

Based on the short-run aggregate supply curve shown, SRAS shifts from SRAS1 to SRAS2 after a pandemic reduces labor availability and raises firms’ costs, while wages and many input contracts adjust slowly in the short run. Which statement best describes the short-run macroeconomic effects implied by the shift?

Question graphic

The price level falls and real GDP falls in the short run.

The price level falls and real GDP rises in the short run.

The price level rises and real GDP falls in the short run.

The price level rises and real GDP rises in the short run.

The price level and real GDP both remain unchanged in the short run.

Explanation

The short-run aggregate supply (SRAS) curve shows the relationship between the price level and real GDP when some input prices, particularly wages, are sticky. When a pandemic reduces labor availability through illness, caregiving needs, or health concerns, firms face a smaller workforce and must often pay higher wages or overtime to maintain operations, raising their per-unit labor costs. Since many wages and input contracts adjust slowly in the short run, firms cannot immediately renegotiate all costs, causing the SRAS curve to shift leftward from SRAS1 to SRAS2. This adverse supply shock means firms produce less at every price level due to both higher costs and reduced capacity. The result is stagflation: real GDP falls as production declines, while the price level rises as firms pass on their higher costs to consumers. A common misconception is viewing pandemics only through demand effects—while spending may change, the supply-side disruptions through SRAS are often more significant. Remember the key principle: when production costs rise or capacity falls, SRAS shifts left, causing the painful combination of higher prices and lower output.

8

Based on the short-run aggregate supply curve shown, nominal wages rise due to a new multiyear labor contract, but firms’ product prices adjust more slowly in the short run. Which statement best describes the shift from SRAS1 to SRAS2 and the short-run effects on the price level and real GDP?

Question graphic

SRAS shifts left; the price level falls and real GDP rises in the short run.

SRAS shifts right; the price level falls and real GDP rises in the short run.

SRAS shifts left; the price level rises and real GDP falls in the short run.

SRAS does not shift; higher nominal wages only affect long-run aggregate supply.

SRAS shifts right; the price level rises and real GDP rises in the short run.

Explanation

The short-run aggregate supply (SRAS) curve shows how much output firms will produce at different price levels when some input prices are sticky or slow to adjust. When nominal wages rise due to a new labor contract while product prices adjust more slowly, firms face higher per-unit labor costs that cannot be immediately offset by raising prices. This increase in production costs shifts the SRAS curve leftward from SRAS1 to SRAS2, indicating that firms will supply less output at any given price level. The result is a decrease in real GDP as firms cut production to maintain profitability, while the price level rises as firms eventually pass on their higher labor costs to consumers. A common misconception is thinking wage increases shift AD through higher consumer spending—while this may happen, the immediate effect on SRAS through higher costs dominates in the short run. Remember the key strategy: changes in input costs (wages, energy, materials) shift SRAS, not changes in spending patterns.

9

Based on the short-run aggregate supply curve shown, the economy experiences a sustained increase in oil and natural gas prices that raises firms’ per-unit production costs while nominal wages are sticky in the short run. Which statement best describes the shift from SRAS1 to SRAS2 and the short-run effects on the price level and real GDP?

Question graphic

SRAS shifts right; the price level falls and real GDP rises in the short run.

SRAS does not shift; the change is a movement along SRAS caused by higher aggregate demand.

SRAS shifts left; the price level rises and real GDP falls in the short run.

SRAS shifts left; the price level falls and real GDP rises in the short run.

SRAS shifts right; the price level rises and real GDP rises in the short run.

Explanation

The short-run aggregate supply (SRAS) curve shows the relationship between the price level and real GDP when some input prices, particularly wages, are sticky or slow to adjust. When oil and natural gas prices increase, firms face higher per-unit production costs for energy, transportation, and materials. Since nominal wages are sticky in the short run, firms cannot immediately offset these higher costs by reducing wages, so the SRAS curve shifts left from SRAS1 to SRAS2. This leftward shift means that at any given price level, firms are now willing to supply less output because production has become more expensive. The result is stagflation: the price level rises as firms pass on higher costs to consumers, while real GDP falls as the economy produces less. A common misconception is confusing this with an AD shift—remember that cost changes shift SRAS, while spending changes shift AD.

10

Based on the short-run aggregate supply curve shown, the economy experiences a rise in the world price of oil, which increases firms’ energy input costs while nominal wages and many product prices remain sticky in the short run. Which of the following best describes the shift from $SRAS_1$ to $SRAS_2$ and its short-run effects on the price level and real GDP?

A movement along SRAS that raises the price level and lowers real GDP in the short run.

A rightward shift of SRAS that raises the price level and raises real GDP in the short run.

A leftward shift of SRAS that raises the price level and lowers real GDP in the short run.

A leftward shift of SRAS that lowers the price level and lowers real GDP in the short run.

A rightward shift of SRAS that lowers the price level and raises real GDP in the short run.

Explanation

The short-run aggregate supply (SRAS) curve shows the relationship between the price level and real GDP when input prices, especially wages, are sticky and don't adjust immediately. When oil prices rise, this increases firms' energy costs, which are a key input in production. Since wages and many prices are sticky in the short run, firms face higher per-unit production costs without being able to immediately adjust all prices or wages. This causes the SRAS curve to shift leftward (from SRAS₁ to SRAS₂), meaning firms will produce less output at any given price level. The result is stagflation: the price level rises while real GDP falls, creating both inflation and reduced economic output. The key strategy here is that when input costs rise (negative supply shock), SRAS shifts left, causing higher prices and lower output.

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