一、案情简介 1995年11月13日,离休老干部牛大爷陪同老伴上步行街购买物品,走至一商店前观看冬季皮装。牛大爷指着一件山羊皮夹克衫问:这件皮衣卖多少钱?店主马某回答说:老大爷你是否打算买,如果真想买可以便宜一些。牛大爷接着说:我试一试,价钱合适就买。马某便拿下一件皮夹克杉给他试穿。牛大爷脱下棉衣试穿皮夹克。店主马某说:老大爷您穿着这件皮夹克衫顶合身,也很精神的。这件原价是1800元,现在 I. Introduction to the case On November 13, 1995, retired veteran Niu uncle accompanied his wife to buy goods on the pedestrian street and went to a store to watch the winter leather goods. Cow uncle pointed at a goat leather jacket Q: How much is the leather? The owner Ma Mou replied: Grandpa Do you intend to buy, if you really want to buy can be cheaper. Uncle Niu went on to say: I try it, the price is right to buy. Ma will win a leather jacket to try on him. Uncle Niu coat try on leather jacket. Ma Moumou owner said: Grandpa you wear this jacket jacket top fit, very spiritual. This original price is 1800 yuan, now