我们以每个两元的价格出售手工制作的蛋糕，为穷人募捐。
We sold handmade cakes for 2 yuan each to collect money for poor people.
以商品或资产价格为基础的契约 出现的时间 几乎和人类 开始从事贸易的时间 差不多，这说明他们 很有用 。
That contracts based on the price of some commodity or asset have been around for about as long as mankind has been trading indicates that they are pretty useful.
很多公司已经开始提供以顾客为导向的价格和产品选择。
Many companies are beginning to offer more customer-driven prices and choices.
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