在分析政府采购活动的费用时，我们一般都假设政府采购这一交易活动中不存在“阻力”，亦即交易费用假设为零。经济活动中“无磨擦”的假设，是新古典经济学理论的一个通常的假设。而实际上，任何经济活动不可能是没有一点阻力，经济活动中存在的“磨擦”──交易费用是经常的 When analyzing the costs of government procurement activities, we generally assume that there is no “resistance” in the government procurement activity, which means the transaction costs are assumed to be zero. The assumption of “no friction” in economic activities is a common assumption of neoclassical economic theory. In fact, any economic activity can not be without any resistance. The “friction” in economic activities ─ ─ transaction costs are often