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一、城市发展与交通当从事劳动的人们,在他们生产的产品除了自己消耗以外,还必须拿出一部分用于交换,以换取其生活的一些必须品,这些在特定的时间、地点进行交换的方式,就形式了集市、交换最直接的方式是以物易物。当物质交换不能满足各方需求的时候就产生了货币,以货币作为交换手段就是贸易。当
I. Urban Development and Transportation When working in the production of their products in addition to their own consumption, but also must be part of the exchange for some of their necessities of life, these at a specific time and place to exchange Way, the form of the market, the most direct way to exchange is barter. When the material exchange can not meet the needs of all parties, money is generated, and exchange of currency means trade. when