为了钱或其相等物而交换所有权；从事买卖。
To exchange ownership for money or its equivalent; engage in selling.
所有的东西都是商品，所有的人都从事买卖活动。
既不生产又不消费，但是从事买卖，买进就是为了卖出，从价差中赚钱，这是投机性的。
While neither production nor consumption take place, but people are engaged in trade, to buy is to sell and make money from prices fluctuation, which is speculative.
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