commodity 是指商品,特指工业制成品（非原料、半成品）；

goods 是货物的泛称,一般生活或商业用词,指销售或购入的商；

product是指（自然、化学或工业过程的）产物，生成物，产品。

举例说明：

1、commodity：

（1）、Many brokers were charged with cheating customers in commodity trades.

许多经纪人被指控在商品交易中欺骗顾客。

（2）、One can measure the utility of a movie ticket by asking how much of some other commodity (like hamburgers)you are willing to give up for it.

你可以通过询问为看场电影愿意放弃多少其他商品（如汉堡）来测量电影的效用。

2、goods：

（1）、We've ready to place an order with you, but only one condition is to at goods are confined to Taiwan.

我准备向你们订货，但是唯一的条件是，货物只限卖给导航的么公司。

（2）、All his worldly goods were packed into a neat checked carrier bag

他的所有家当都装在一个干净的方格图案手提袋里。

3、product：

（1）、Not only was the product innovative, but the methodology was as well.

不仅仅是作品的创新性，还有创新的方法。

（2）、The reason is simple: Penetration pricing often means that the product may be sold at a loss for a certain length of time.

道理很简单：使用渗透价格常常意味着产品在一定时间内是要以亏本价卖出的。