goldTD,是指由上海黄金交易所统一制定的、规定在将来某一特定的时间和地点交割一定数量标的物的标准化合约,那么,黄金td和纸黄金、实物黄金及黄金futures投资相比有什么优势?This type of buying and selling is participated in by producers and operators who transfer the risk of price fluctuations and risk investors who bear price risks and make profits. It is conducted in accordance with the law and fair competition within the exchange, and is guaranteed by a margin system.