Study Notes
Aggregate Supply (AS) refers to the total planned supply of all producers in a country, divided into Short-run Aggregate Supply (SRAS) and Long-run Aggregate Supply (LRAS). SRAS represents output when factor prices haven't adjusted to changes in aggregate demand, while LRAS represents output when factor prices have fully adjusted.
- Aggregate Supply (AS) — total planned supply of all producers in a country. Example: The sum of goods and services that firms plan to sell at different price levels.
- Short-run Aggregate Supply (SRAS) — output supplied when factor prices haven't adjusted to changes in aggregate demand. Example: A period where wages remain constant despite changes in demand.
- Long-run Aggregate Supply (LRAS) — output supplied when factor prices have fully adjusted to changes in aggregate demand. Example: An economy operating at full capacity with all resources fully utilized.
- Profit Effect — as price levels rise, the gap between output and input prices widens, leading to increased profits. Example: A firm earns more as product prices increase faster than wages.
- Cost Effect — average costs rise with increased output due to factors like overtime payments. Example: A factory incurs higher costs when it increases production to meet demand.
- Misinterpretation Effect — producers may interpret a rise in price level as increased demand. Example: A company boosts production thinking demand has increased when prices rise.
- Shifts in SRAS — changes in factor prices, taxes, productivity, and resource quantity can shift the SRAS curve. Example: A tax cut for businesses can shift the SRAS curve to the right.
- Shifts in LRAS — changes in resource quantity and quality, such as improved education or technological advances, can shift the LRAS curve. Example: Discovering new oil reserves increases a country's productive potential.
Exam Tips
Key Definitions to Remember
- Aggregate Supply (AS)
- Short-run Aggregate Supply (SRAS)
- Long-run Aggregate Supply (LRAS)
- Profit Effect
- Cost Effect
- Misinterpretation Effect
Common Confusions
- Confusing SRAS with LRAS
- Misunderstanding the reasons for shifts in SRAS and LRAS
Typical Exam Questions
- What is the difference between SRAS and LRAS? SRAS is the output when factor prices haven't adjusted, while LRAS is when they have fully adjusted.
- How do changes in factor productivity affect aggregate supply? Increased productivity shifts both SRAS and LRAS to the right.
- What causes shifts in the LRAS curve? Changes in resource quantity and quality, such as technological advances or improved education.
What Examiners Usually Test
- Understanding of the SRAS and LRAS concepts
- Ability to explain shifts in aggregate supply curves
- Knowledge of factors affecting aggregate supply in the short and long run