边际使用者成本——使用者最后一单位资源成本。

Marginal user cost----The user cost of the last unit of resource.

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历届政府都允许这种增长，理由是投资和运营铁路网络的成本应由使用者承担，而不是一般纳税人。

Successive governments have permitted such increases on the grounds that the cost of investing in and running the rail network should be borne by those who use it, rather than the general taxpayer.

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基本上，如果公园给使用者带来的收益大于给纳税者带来的损失，我们就说公修建公园的效益大于成本。

In principle, the park provides greaterbenefits than costs if the benefits to the users exceed the losses to thetaxpayers.

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