What is happening at the upward-sloping section of aggregate supply (AS)?

Question

BlackTom AI · Accepted Answer

On the upward-sloping section of the short-run aggregate supply (AS) curve firms face rising marginal costs as output expands, so higher price levels are required to induce greater production.

1) Relevant knowledge points and concepts
- Short-run AS is upward sloping because some input prices (wages, contracts) are sticky while product prices can adjust; as demand pushes output toward capacity, marginal costs and prices rise.
- The economy on this segment is near full employment: unemployment and idle capacity are limited, so further increases in real GDP require using scarcer resources.
- Price-output tradeoff: when spare capacity is small, expanding output tends to increase the general price level.

2) Step-by-step reasoning
Step 1: On the horizontal (Keynesian) portion, output can rise without much price change because plenty of idle resources exist.  
Step 2: Moving to the upward-sloping portion, unused resources (labor, capital) decline and firms encounter rising marginal cost.  
Step 3: To cover higher marginal costs and to ration scarce inputs, firms raise prices; thus, any attempt to raise total output leads to a higher price level.

3) Intermediate logical steps (no numeric calculation required)
- If spare capacity ≈ low, additional units of output require overtime, more expensive inputs, or bidding up wages → marginal cost ↑.  
- Higher marginal cost → firms increase prices to maintain profit margins → aggregate price level rises as output increases.

4) Why the correct answer is correct
Each listed statement describes the same economic condition characteristic of the upward-sloping AS: (a) output cannot increase without price rising, (b) few unused resources exist, (c) little spare capacity remains. They are mutually consistent implications of being on that AS segment.

5) Why the other options are not the sole answer
Each individual option is true but incomplete when presented alone; the best choice recognizes that all three are simultaneous features of the upward-sloping AS.

6) Conclusion
Therefore, the correct answer is “all of these,” which matches the provided answer.

What is happening at the upward-sloping section of aggregate supply (AS)?Single choice

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