Mastering Aggregate Supply for Your AP Macro Exam

📖 Quick Study Guide: Aggregate Supply Essentials

• 💡 Aggregate Supply (AS): Represents the total quantity of goods and services that firms in an economy are willing and able to produce at different price levels.
• 📊 Short-Run Aggregate Supply (SRAS): This curve is upward-sloping because, in the short run, some input prices (like wages) are 'sticky' or slow to adjust to changes in the overall price level. As the price level rises, firms' revenues increase faster than their costs, leading them to increase output.
• 📈 Long-Run Aggregate Supply (LRAS): This curve is vertical at the economy's potential output or full-employment real GDP ($Y_f$). In the long run, all input prices are fully flexible, meaning changes in the price level do not affect the economy's capacity to produce. LRAS is determined by resources, technology, and institutions.
• ⚙️ Shifters of SRAS: Factors that change the cost of production for firms will shift the SRAS curve. These include changes in input prices (wages, raw materials), productivity, government taxes or subsidies on businesses, and inflationary expectations.
• 🚀 Shifters of LRAS: Changes in the quantity or quality of the economy's productive resources (land, labor, capital), improvements in technology, and changes in human capital (education, skills) will shift the LRAS curve. These factors determine the economy's long-term growth potential.
• ⚖️ Equilibrium: The intersection of the Aggregate Demand (AD) curve and the AS curve (either SRAS or LRAS) determines the economy's equilibrium price level and real GDP.
• 🌍 Key Distinction: SRAS is about current production decisions given sticky prices, while LRAS reflects the economy's maximum sustainable output given its available resources and technology.

🧠 Practice Quiz: Test Your AS Knowledge

1. Which of the following would cause the short-run aggregate supply (SRAS) curve to shift to the left?
   A. A decrease in nominal wages
   B. An increase in the price of crude oil
   C. An improvement in technology
   D. A decrease in business taxes
2. The long-run aggregate supply (LRAS) curve is vertical at the natural rate of unemployment because:
   A. In the long run, all prices and wages are flexible, and the economy produces at its full potential.
   B. It represents the maximum output an economy can produce in the short run.
   C. It only shifts due to changes in the price level.
   D. It is determined solely by aggregate demand.
3. An increase in the economy's capital stock would most likely:
   A. Shift the SRAS curve to the left only.
   B. Shift the AD curve to the right only.
   C. Shift both the SRAS and LRAS curves to the right.
   D. Shift the LRAS curve to the left only.
4. If the actual price level is higher than the expected price level, firms will:
   A. Decrease output, shifting SRAS to the left.
   B. Keep output constant, as expectations don't affect production.
   C. Increase output in the short run, moving along the SRAS curve.
   D. Decrease output in the long run, shifting LRAS to the left.
5. Which of these factors would cause a shift in the LRAS curve?
   A. A change in the general price level.
   B. An increase in the labor force.
   C. A decrease in consumer confidence.
   D. A reduction in government spending.
6. A decrease in the cost of a major raw material used by many industries would:
   A. Shift the SRAS curve to the right.
   B. Shift the SRAS curve to the left.
   C. Shift the LRAS curve to the left.
   D. Cause a movement down along the SRAS curve.
7. If an economy is operating above its full-employment output in the short run, what is likely to happen in the long run?
   A. Nominal wages will fall, shifting SRAS to the right.
   B. The LRAS curve will shift to the right to accommodate the higher output.
   C. Aggregate demand will decrease, restoring equilibrium.
   D. Nominal wages will rise, shifting SRAS to the left, returning to full employment.