三、請定義何謂規模報酬(Return to Scale)與規模經濟(Economies of Scale)？若某航空公司生產函數為 Q = 2 K 0.6 L0.5 ，其中 Q 為產量；K、L 為生產要素；長期總成本為 TC = 500 + Q 。該航空公司是否具有規模報酬遞增、規模經濟的現象？請判斷並說明之。(25 分)

二、英譯中：Translate the following passage into Chinese(20 分) According to a 2026 report published by Travel Weekly Asia, travel agents in Thailand strongly opposed the government’s proposal to impose a departure tax of approximately US$30 on Thai travelers. The government estimated that the tax could generate significant revenue to support domestic tourism programs. However, travel industry representatives argued that the additional charge could increase travel costs and place more pressure on the tourism sector during a period of economic uncertainty and rising expenses related to the Middle East conflict. The Thai Travel Agents Association also questioned how the revenue would be managed and allocated. The proposed tax would apply only to Thai citizens and would be separate from the existing tourism tax charged to inbound international visitors.

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