a way of setting the price for a product or service in which the price changes according to how much demand there is for it at a particular time (= how many people want to buy it or pay for it)

The goal of dynamic pricing is to allow a company that sells goods or services over the Internet to adjust prices in response to market demands. 动态定价是为了让通过互联网销售商品或服务的公司根据市场需求调整价格。

We operate a dynamic pricing system, which means fares start to rise as the train starts to fill up. 我们实行的是动态定价系统，这意味着当火车开始满员时，票价就会开始上涨。