The postal industry is considered to be the natural monopoly industry traditionally.
邮递业在传统上被认为是自然垄断产业。
The characteristic of the natural monopoly of the latest definition is the cost subadditivity.
最新定义的自然垄断的特点是代表性企业成本函数的弱增性。
Practice attempting to totally abandon the natural monopoly theory has already been proved wrong too.
试图完全抛弃自然垄断理论的实践已被证明是错误的。
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