What is important in dealing with state-to-state relationship is to see whether one follows the widely-accepted principles.

国与国之间打交道，重要的是要看是不是占“理”。

It argues that charging policy, based on marginal cost pricing, is economically efficient, and facts show that relevant principles are more widely accepted by airport operators.

利用边际成本定价模式确定飞机所需交纳的起降费从经济学角度来说是富于效率的，并且相关的原则也为越来越多的机场所采纳。