征收通行费在经济上是有效的，它针对过度使用的资源（拥堵的道路）引入了价格杠杆。
Tolling is economically efficient: it prices an overused resource (crowded roads).
在收费公路特许经营谈判过程中，通行费价格的确定和调整是核心问题之一。
During the concession negotiation of toll road, one of the core problems is tariff determining and regulating.
这一机制有时会被用于设置高速公路通行费(为保证交通顺畅，通行费因需求而上涨、下调)，或者用于调整电力市场上能源价格。
Such systems are sometimes used to set motorway tolls (which rise and fall with demand in an effort to keep traffic flowing), or to adjust the price of energy in electricity markets.
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