一种推定原则。 存在两个原子命题P和Q，当P为真命题、Q为假命题时，P→Q为一个假命题。 当P为假命题时，无论Q是否为假命题，P→Q总为真命题，这就叫做“善意推定”。
严格责任实行罪过推定、允许善意辩护，使得这一制度具有了合理内核，实现了效率与一般正义两价值的协调与统一。
Fault inference and goodwill defence in strict liability, making the system is a reasonable core, and the efficiency of the two values of justice and the general coordination and unification.
由于交易的频发性，人们在客观上无力去清查每件商品的来源，购买者仅能根据公示公信之原则推定其为普通物品而善意购买并占有之。
Because of frequent trading, people are unable to check the source of each item, the buyers buy goods just under the principle of presumption of public summons for the common items and goodwill.
此外，关于占有的修正，增订了占有权利推定之例外规定；修正动产善意取得制度等。
In addition, in the amendments on possession, exception regulations about presumption of possession rights were added, and the system of bona fide acquisition of movables was also revised.
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