trade over the internet 通过互联网的贸易

(random thoughts from one sentence)

The internet changed the picture of trade because buyers can now find sellers who are willing to sell things, and especially information, at a much lower price, often free, than what they were able to find without internet.

互联网改变了贸易的格局，因为购买者现在可以找到愿意以很低价，甚至免费，去提供货品的人，尤其是信息，这是没有网络时找不到的。