expenses incurred for the security of transaction and benefits resulting from the convenience of transaction,as well as considerations of the exteriority of such publication.

• 公示是否应该成为物权变动的构成要件,关键取决于公示所带来的成本与收益的比较,即对交易安全与交易便捷的成本与收益的权衡,以及对公示外部性的考察。