What is happening at the vertical section of aggregate supply (AS)?

Question

BlackTom AI · Accepted Answer

At the vertical section of the aggregate supply curve, total output cannot increase because the economy is at its full-employment (potential) level of output; any additional aggregate demand only raises the price level.

1) Relevant concepts:
- Aggregate Supply (AS) shows total goods and services firms will produce at each price level.
- In Keynesian/short-run diagrams AS often has three regions: a flat (horizontal) region with large spare capacity, an upward-sloping region where resources become scarcer, and a vertical region at full employment.
- Long-run AS (LRAS) is vertical at potential GDP because real output is determined by factors of production (labor, capital, technology), not the price level.

2) Step-by-step reasoning:
- Start at the vertical segment: firms are using nearly all available labor and capital. 
- If aggregate demand rises, firms cannot expand real output because there are no additional workers or machines readily available to increase production.
- Instead, competition for scarce resources bids up wages and input prices; firms raise output prices rather than quantities. Thus price level increases, output stays the same.

3) Intermediate conceptual steps:
- Resources utilization → at full employment utilization ≈ 100% → marginal cost of producing extra units rises infinitely or impractically → firms respond by increasing prices not quantities.
- In long run, factor supplies and technology set potential output; price-level changes do not shift real output.

4) Why the correct answer is correct:
- "Total output cannot increase" precisely describes the defining feature of the vertical AS: output is fixed at potential GDP regardless of price changes.

5) Why other options are incorrect:
- "All of these" is wrong because the other choices contradict each other (e.g., "plenty of spare production capacity" is opposite of full employment).
- "There are few unused resources" is misleading: the vertical section implies essentially no unused resources, not merely "few."
- "There is plenty of spare production capacity" is false; that describes the horizontal section, not the vertical.

6) Conclusion:
This confirms the provided correct answer: total output cannot increase.

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