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Xét 1 nền kinh tế đóng Hàm tiêu dùng: C = 400 + 0,6 Yd; Hàm đầu tư: I = 500; Chi tiêu chính phủ: G = 280; Thuế: T = 300. Muốn tăng sản lượng cân bằng 50 và giữ cho cán cân ngân sách không thay đổi, thì chính phủ cần thay đổi chi tiêu và thuế cùng một lượng là bao nhiêu

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