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.

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第二种是经销代理人和经纪人，他们是自己经营，但却主要为他人进行买卖的机构。他们对所销售的货物没有货权。

The second, merchandise agents and brokers, are wholesaling establishments whose operators are in business for themselves and are primarily engaged in selling or buying goods for others.

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