未知题型
Use a graph to demonstrate the circumstances that would prevail in a competitive market where firms are earning economic profits. Can this scenario be maintained in the long run? Explain your answer.
【参考答案】
1. **短期市场均衡：** - 横轴表示数量（Q），纵轴表示价格（P）。 - 供给曲线（S）向上倾斜，表示随着......
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