Britons are used to paying variable prices for hotel rooms, train tickets and telephone calls.
英国人习惯于为宾馆、火车票和话费的浮动费用掏钱。
英语百科
Variable pricing
Variable pricing is a pricing strategy for products. Traditional examples include auctions, stock markets, foreign exchange markets, bargaining, electricity, and discounts. More recent examples, driven in part by reduced transaction costs using modern information technology, include yield management and some forms of congestion pricing.