贸易
贸易是自愿个货品或服务交换。贸易也被叫作商业。贸易是拉一个市场里向进行个。最原始个贸易形式是以物易物，即直接交换货品或服务。现代个贸易则普遍以一种媒介作讨价还价，如金钱。金钱个出现（搭子后来个信用证、钞票搭子非实体金钱）大大简化搭促进了贸易。
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