人类社会的商品交换从以物易物 ,经过以货币为媒介进行交易 ,到电子购物 ,商品交易范围日益扩大。今天 ,通过网络可以在全球范围实现在线即时交易。建筑产品作为大宗交易的特殊商品 ,它的购买方法不同于一般商品 ,业主(买方 )通常采用招标投标的竞争形式 ,进行“期货”交易。建 The exchange of goods in the human society is from bartering, through the use of money as a medium for transactions, to e-shopping, and the scope of commodity trading has expanded. Today, online real-time transactions can be realized globally through the Internet. As a special commodity for large-scale transactions, construction products are different from general commodities in their purchase methods. Owners (buyers) usually use “competitive bidding” to conduct “futures” transactions. build