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QN=260 Khi nào tiền tệ ra đời?a. Khi vật ngang giá chung được cố định ở vàng, bạcb. Khi sản xuất và trao đổi đã phát triểnc. Khi không còn quan hệ trao đổi trực tiếp, có một thứ hàng làm trung gian trong trao đổid. Khi nhu cầu trao đổi vượt quá phạm vi quốc gia
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