马甲是世界各国证券交易所进场交易人员指定着装。穿红马甲的是证券交易经纪人，着黄马甲的是中介经纪人。为何交易员非穿马甲不可呢？原来在早期的证券交易所里，经纪人填写各种交易凭证所使用的是鹅毛笔（当时自来水笔、圆珠笔尚未问世），交易大厅内喧嚣的气氛，拥挤的人群 Vests are the world’s stock exchange approach traders designated dress. Wearing a red vest is a stock exchange broker, a yellow vest is an intermediary broker. Why traders do not wear vest can not do? Originally in the early stock exchange, brokers used to fill out a variety of transaction documents are used quill (then fountain pens, ball pens have not yet come out), trading hall atmosphere of the noisy, crowded crowd