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49. Lý thuyết kinh tế vi mô cho rằng giá bán sản phẩm là tối ưu:a. khi bán được nhiều sản phẩm nhấtb. Khi chênh lệch giữa tổng doanh thu và tổng chi phí rất cao nhấtc. khi giá bán có tính cạnh tranh caod. Cả 3 đáp án trên đều đúng

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