自从专业经纪人介入到交易中，交易的性质即开始发生变化：买主及卖主丧失了与市场的一些联系；交易变得越来越复杂，比如说可以以当前价格买卖将来的货物。
Once professional brokers got in on the act, though, the nature of exchanges began to shift. Buyers and sellers lost some of their close contact with markets.
交易变得越来越复杂，例如包括了类似在将来买入某种货物的权利，而价格则是目前讲定的。
Transactions became more complex, involving for instance the right to buy and sell goods in the future at a price fixed in the present.
1728公里的铁路线将来有一天一年可承载三千万吨的货物。
The 1, 728-km line will one day carry 30m tonnes of cargo a year.
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