张某的行为属不当得利雁子看了《人民检察》第５期刊登的讨论案例后，我倾向于文中第一种意见，认为张某的行为应属不当得利。理由如下：１、郑某不慎掉落在地的存折，应视为遗失物。办公室是相对公开的公共场所，它虽然不像商场、电影院等公共场所那样任何人都可以自由出... Zhang’s behavior is improper profit Yanzi read the “People’s Procuratorate” published in the fifth case of the discussion, I tend to the first opinion in the article, that Zhang’s behavior should be unduly beneficial. The reasons are as follows: 1, Zheng accidentally dropped to the passbook, should be considered as lost property. Office is a relatively public place, although it is not like shopping malls, cinemas and other public places as anyone can freely ...