Did you ever find the answer?
Answer:
Option A is correct
Firms have different costs.
Explanation:
Option A is correct
Long run supply curve is upward sloping or constant horizontal line depends on the industry whether it is variable cost industry (increasing production cost) or a constant cost industry respectively. Option A is correct because if firms have different production cost and it is increasing as the output is increasing then it is upward Sloping long-run supply curve.
Answer:
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