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善意取得制度符合卡尔多-希克斯效率、波斯纳定理的要求,善意取得规则下交易活动中的交易成本小于原所有权人规则下的交易成本。在善意取得规则下,存在特定的受让人、原所有权人的注意水平,使得无权处分事故的社会成本最小。当法定善意标准是最优注意水平时,善意取得制度可以对原所有权人与受让人双方提供有效激励,预防无权处分事故的发生。对于善意标准的确定,当原财产所有人主张受让人为恶意时,必须举证证明以受让人的实际认识能力在交易当时的具体条件下不能排除对处分人是否具有处分权的合理怀疑。
The bona fide acquisition system meets the requirements of the Karl-Hicks efficiency and Posner's theorem. The transaction cost under the bona fide acquisition rule is less than the transaction cost under the original owner's rule. Under the rule of goodwill acquisition, there is a certain level of attention paid by the assignee and the original owner, so that the social costs of not having the right to dispose of the accident are minimized. When the statutory goodwill standard is the optimal attention level, the bona fide acquisition system can provide effective incentives for both the original owner and the assignee to prevent the incapacity from being punished. For the determination of goodwill standards, when the original property owner claims that the assignee is malicious, it must prove that the assignee's actual awareness can not exclude the reasonable doubt of whether the disposer has the right to dispose under the specific conditions at the time of the transaction.