Short-Run Aggregate Supply (SRAS) - AP Macroeconomics

1. 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?
   Answer: An increase in the price level and a decrease in real GDP caused by a leftward shift of SRAS from a negative supply shock. 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.
2. Based on the short-run aggregate supply curve shown, suppose economy-wide nominal wages increase due to new multiyear labor contracts, and wages are sticky downward in the short run. Which statement best explains the shift from $SRAS_1$ to $SRAS_2$ and the short-run changes in the price level and real GDP?
   Answer: SRAS shifts left, causing a higher price level and a lower level of real GDP in the short run. The SRAS curve represents the total quantity of goods and services firms will produce at different price levels when some input costs are fixed in the short run. When nominal wages increase through new labor contracts, this directly raises firms' per-unit labor costs. Since wages are sticky downward (meaning they don't easily fall once set), firms cannot quickly adjust these costs downward. Higher labor costs mean firms need higher prices to maintain profitability at each output level, shifting SRAS leftward from SRAS₁ to SRAS₂. This leftward shift results in a higher price level and lower real GDP in the short run, as firms produce less at any given price level. A common misconception is thinking wage changes cause movements along SRAS, but wage changes are a determinant that shifts the entire curve. Remember: higher input costs (including wages) shift SRAS left, leading to higher prices and lower output.
3. Based on the short-run aggregate supply curve shown, the shift from SRAS1 to SRAS2 is caused by higher nominal wages that increase firms' costs in the short run. Which statement correctly distinguishes this SRAS shift from a movement along SRAS caused by changes in aggregate demand?
   Answer: SRAS shifts because per-unit production costs changed, whereas a movement along SRAS would reflect a change in the price level with firms supplying a different real GDP. The short-run aggregate supply (SRAS) curve represents the relationship between the price level and real GDP when some input prices are sticky. A shift of the SRAS curve occurs when firms' per-unit production costs change due to factors like wages, energy prices, or productivity—in this case, higher nominal wages increase labor costs, shifting SRAS leftward from SRAS1 to SRAS2. In contrast, a movement along the SRAS curve happens when the overall price level changes (typically due to AD shifts), causing firms to adjust their quantity supplied while their underlying cost structure remains constant. The key distinction is that SRAS shifts reflect changes in production costs that affect firms' willingness to supply at all price levels, while movements along SRAS reflect firms' responses to price level changes given their existing cost structure. Students often confuse these by thinking any change in output must shift SRAS, but remember: cost changes shift the curve, while price level changes cause movement along the curve. This transferable principle applies to all supply curves: input cost changes shift the curve, while output price changes cause movements along it.
4. Due to improved worker training programs, firms can produce more output with the same inputs, while nominal wages remain fixed in the short run. Based on the short-run aggregate supply curve shown, which statement best describes how the shift from $SRAS_1$ to $SRAS_2$ affects the price level and real GDP in the short run?
   Answer: The price level decreases and real GDP increases because SRAS shifts right from higher productivity. The short-run aggregate supply (SRAS) curve shows the relationship between price levels and output when nominal wages are fixed. Improved worker training programs increase productivity—workers can produce more output with the same time and resources, effectively reducing per-unit production costs. With nominal wages remaining fixed in the short run, firms benefit from lower costs per unit of output produced. The graph illustrates SRAS shifting rightward from SRAS₁ to SRAS₂, indicating firms are willing to supply more at each price level due to improved efficiency. This rightward shift leads to a new equilibrium with a lower price level and higher real GDP—a win-win scenario of growth with disinflation. Students sometimes think all supply changes are negative; remember that productivity improvements are positive supply shocks that shift SRAS right, lowering prices while increasing output.
5. Based on the short-run aggregate supply curve shown, a broad improvement in technology and worker training raises labor productivity, lowering per-unit costs while many nominal wages are fixed by contract 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?
   Answer: SRAS shifts right; the price level falls and real GDP rises in the short run. The short-run aggregate supply (SRAS) curve represents the relationship between the price level and real GDP when some input prices, particularly wages, are sticky. When technology improves and workers receive better training, labor productivity increases—meaning each worker can produce more output per hour. With nominal wages fixed by contracts in the short run, this higher productivity effectively lowers firms' per-unit labor costs (same wage, more output). This reduction in production costs shifts the SRAS curve rightward from SRAS1 to SRAS2, indicating firms are willing to supply more output at every price level. The result is an increase in real GDP as the economy's productive capacity expands, while the price level falls as lower costs allow firms to charge lower prices while maintaining profits. Students often confuse this with AD effects from investment spending, but the key is that productivity improvements directly reduce costs and shift SRAS. The transferable strategy remains: cost decreases shift SRAS right, cost increases shift SRAS left.
6. Based on the short-run aggregate supply curve shown, a sudden global shortage of a key imported component raises input prices for domestic manufacturers, and many firms cannot quickly change wages or contracts 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?
   Answer: SRAS shifts left; the price level rises and real GDP falls in the short run. The short-run aggregate supply (SRAS) curve shows the total output firms are willing to produce at different price levels when some input prices are sticky. A global shortage of a key imported component directly raises input prices for manufacturers who depend on these materials for production. Since firms cannot quickly renegotiate wages or other contracts in the short run, they face higher per-unit production costs that cannot be immediately offset. This increase in production costs shifts the SRAS curve leftward from SRAS1 to SRAS2, meaning firms will produce less output at any given price level. The macroeconomic result is stagflation: real GDP falls as firms reduce production due to higher costs, while the price level rises as businesses pass these costs on to consumers. A common misconception is thinking supply shortages only affect specific industries—in reality, key input shortages can ripple through the entire economy via SRAS. Remember: when input costs rise (whether wages, energy, or materials), SRAS shifts left; when costs fall, SRAS shifts right.
7. Technological improvements in manufacturing raise output per worker, but nominal wages are slow to adjust due to multiyear contracts. Based on the short-run aggregate supply curve shown, which option best characterizes the shift from $SRAS_1$ to $SRAS_2$ as cost-push or productivity-driven, and the short-run changes in the price level and real GDP?
   Answer: Productivity-driven rightward shift with a lower price level and higher real GDP. The short-run aggregate supply (SRAS) curve illustrates how much firms will produce at various price levels when nominal wages are sticky due to contracts. Technological improvements that raise output per worker represent a positive productivity shock—firms can produce more with the same inputs, effectively lowering per-unit production costs. Since nominal wages are slow to adjust upward due to multiyear contracts, firms enjoy temporarily higher profit margins and increase production. The graph shows SRAS shifting rightward from SRAS₁ to SRAS₂, indicating more output supplied at each price level. This is a productivity-driven rightward shift, resulting in a lower price level and higher real GDP—beneficial supply-side effects. Students often confuse all SRAS shifts with cost-push inflation; remember that productivity improvements shift SRAS right (good news), while cost increases shift SRAS left (bad news).
8. An economy experiences a sudden increase in global oil prices that raises transportation and production costs for many firms. Based on the short-run aggregate supply curve shown, which statement best explains the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP, assuming nominal wages are sticky in the short run?
   Answer: An increase in the price level and a decrease in real GDP caused by a leftward shift of SRAS due to higher input prices. The short-run aggregate supply (SRAS) curve shows the relationship between the price level and real GDP when some input prices, particularly nominal wages, are sticky or slow to adjust. When global oil prices increase, this raises production costs for firms across the economy. Because nominal wages are sticky in the short run, firms face higher per-unit costs but cannot immediately reduce wages to compensate. The graph shows SRAS shifting leftward from SRAS₁ to SRAS₂, which means firms are willing to supply less output at each price level due to higher costs. This leftward shift causes the economy to move to a new short-run equilibrium with a higher price level and lower real GDP—a situation called stagflation. A key misconception is confusing supply shocks with demand shocks; remember that cost changes shift SRAS, while spending changes shift AD.
9. Based on the short-run aggregate supply curve shown, a sudden increase in global oil prices raises firms' per-unit production costs while nominal wages are sticky in the short run. Which change in the economy is most consistent with the shift from $SRAS_1$ to $SRAS_2$, and what happens to the price level and real GDP in the short run?
   Answer: A negative supply shock shifts SRAS left, causing the price level to rise and real GDP to fall in the short run. The short-run aggregate supply (SRAS) curve shows the relationship between the price level and real GDP when some input prices, particularly nominal wages, are sticky or slow to adjust. When global oil prices increase, this represents a negative supply shock that raises firms' per-unit production costs. Since nominal wages are sticky in the short run, firms cannot immediately offset these higher costs by reducing wages, so they reduce production at each price level. This causes the SRAS curve to shift leftward from SRAS₁ to SRAS₂. The result is stagflation: the price level rises (as firms pass on higher costs) while real GDP falls (as production becomes less profitable). A common misconception is confusing supply shocks with demand changes—remember that cost changes shift SRAS, while spending changes shift AD.
10. 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?
    Answer: The price level rises and real GDP falls in the short run. 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.
11. Based on the short-run aggregate supply curve shown, suppose the price of imported raw materials rises sharply, increasing firms' input costs, and many wages and prices are sticky in the short run. Which statement best distinguishes this SRAS shift from a movement along SRAS and identifies the short-run effects on the price level and real GDP?
    Answer: It is a leftward SRAS shift that raises the price level and lowers real GDP in the short run. SRAS shows the quantity of output firms will produce at different price levels when some input costs are sticky. When imported raw material prices rise sharply, this directly increases firms' input costs, similar to an oil price shock. With sticky wages and prices, firms cannot immediately pass all costs to consumers or reduce wage costs, so their per-unit production costs rise. This causes SRAS to shift leftward from SRAS₁ to SRAS₂, not a movement along the curve. A movement along SRAS occurs when the price level changes due to demand shifts, but here the fundamental cost structure has changed. The leftward shift results in a higher price level and lower real GDP - classic stagflation. The distinction is crucial: cost changes shift SRAS, while price level changes from demand shifts cause movements along SRAS.
12. Based on the short-run aggregate supply curve shown, the shift from SRAS1 to SRAS2 is attributed to a decrease in input prices (such as lower shipping and fuel costs) that reduces firms' per-unit costs while many prices are sticky in the short run. Which statement best describes the direction of the SRAS shift and the short-run effects on the price level and real GDP?
    Answer: SRAS shifts right; the price level falls and real GDP rises in the short run. The short-run aggregate supply (SRAS) curve represents the total output firms are willing to produce at different price levels when some input prices are sticky. When input prices decrease—such as lower shipping and fuel costs—firms experience a reduction in their per-unit production costs for transportation, logistics, and energy-dependent processes. With many prices sticky in the short run, these cost savings allow firms to produce more profitably at any given price level, shifting the SRAS curve rightward from SRAS1 to SRAS2. This favorable supply shock increases the economy's ability to produce, resulting in higher real GDP as firms expand output to take advantage of lower costs. Simultaneously, the price level falls as competitive pressures lead firms to pass some cost savings to consumers through lower prices. Students sometimes mistakenly think only cost increases affect SRAS, but cost decreases are equally important—they shift SRAS right, creating the beneficial combination of economic growth with lower inflation. The transferable strategy remains consistent: input cost changes shift SRAS, with decreases shifting right and increases shifting left.
13. 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?
    Answer: SRAS shifts left; the price level rises and real GDP falls in the short run. 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.
14. A nationwide labor contract raises nominal wages for many workers, increasing firms' costs in the short run while product prices adjust more slowly. Based on the short-run aggregate supply curve shown, which statement best describes the shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?
    Answer: An increase in the price level and a decrease in real GDP caused by a leftward shift of SRAS due to higher nominal wages. The short-run aggregate supply (SRAS) curve shows how much output firms will produce at various price levels when some costs, especially wages, are sticky. When nominal wages increase through labor contracts, this directly raises firms' production costs per unit of output. Since product prices adjust more slowly than these wage increases in the short run, firms face a profit squeeze and reduce their quantity supplied at each price level. The graph illustrates this as a leftward shift from SRAS₁ to SRAS₂, meaning less output is produced at every price level. This shift creates a new equilibrium with a higher price level and lower real GDP—firms pass some costs to consumers through higher prices while reducing production. A common error is thinking wage increases shift SRAS right; remember that higher input costs always shift SRAS left because they make production more expensive.
15. 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?
    Answer: A negative supply shock shifts SRAS left, raising the price level and lowering real GDP in the short run. 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.
16. Based on the short-run aggregate supply curve shown, assume a major hurricane disrupts production and distribution, reducing available inputs and raising per-unit costs while many prices and wages are sticky in the short run. Which option correctly identifies the SRAS shift from $SRAS_1$ to $SRAS_2$ and the short-run effects on the price level and real GDP?
    Answer: SRAS shifts left, leading to a higher price level and a lower level of real GDP in the short run. SRAS shows how much firms will produce at different price levels when some costs are sticky in the short run. A major hurricane represents a negative supply shock that disrupts production facilities, transportation networks, and the availability of inputs. With sticky wages and prices, firms cannot immediately adjust all costs, but they face higher per-unit production costs due to scarcity of inputs and damaged infrastructure. This causes SRAS to shift leftward from SRAS₁ to SRAS₂, as firms will produce less at any given price level. The result is a higher price level and lower real GDP - a combination known as stagflation. Students often confuse supply shocks with demand changes; hurricanes affect production capacity (supply), not consumer spending (demand). The strategy is: natural disasters that damage production capacity shift SRAS left, causing prices to rise and output to fall.
17. 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?
    Answer: SRAS shifts right, causing the price level to fall and real GDP to rise in the short run. 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.
18. A government report shows that unit labor costs fall because firms reorganize production to reduce wasted time, while nominal wages remain unchanged in existing contracts. Based on the short-run aggregate supply curve shown, which statement best explains the shift from $SRAS_1$ to $SRAS_2$ and why it is consistent with sticky wages in the short run?
    Answer: SRAS shifts right because productivity rises, lowering the price level and raising real GDP with sticky wages. The short-run aggregate supply (SRAS) curve shows output levels at different prices when nominal wages are sticky. When firms reorganize production to reduce wasted time, they increase productivity—getting more output from the same inputs, which lowers unit labor costs even though nominal wages stay unchanged. This is perfectly consistent with sticky wages because the efficiency gains come from better organization, not wage changes. The graph shows SRAS shifting rightward from SRAS₁ to SRAS₂, as lower per-unit costs make firms willing to produce more at each price level. This rightward shift creates a new equilibrium with a lower price level and higher real GDP—positive supply-side effects. Students often think sticky wages prevent any SRAS shifts, but the key insight is that productivity changes can shift SRAS even when wages are fixed—use the rule that anything lowering per-unit costs shifts SRAS right.
19. 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?
    Answer: A leftward shift of SRAS that raises the price level and lowers real GDP in the short run. 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.
20. Based on the short-run aggregate supply curve shown, suppose economy-wide nominal wages decline due to renegotiated contracts, lowering firms' per-unit labor costs while many other prices 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?
    Answer: SRAS shifts right, so the price level falls and real GDP rises in the short run. SRAS shows the relationship between price level and real GDP when some input costs are fixed in the short run. When nominal wages decline through renegotiated contracts, this directly reduces firms' per-unit labor costs, which typically represent a large portion of total costs. With other prices adjusting slowly, firms benefit from lower production costs and can profitably produce more at any given price level. This causes SRAS to shift rightward from SRAS₁ to SRAS₂. The rightward shift results in a lower price level and higher real GDP, as increased production and competition drive prices down while output expands. Students sometimes think wage changes cause movements along curves, but wages are an input cost that shifts SRAS. Remember: lower input costs (including wages) shift SRAS right, leading to lower prices and higher output.

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