A subadditivity test for the cost function of the principal European railways
A subadditivity test for the cost function of the principal European railways
复制标题
欧洲主要铁路成本函数的次可加性测试
DOI：
10.1080/014416400412814
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发表时间：
2000
影响因子：
9.8
通讯作者：
P. C. Sánchez
中科院分区：
文献类型：
--
作者：
P. C. Sánchez
本文的目的是比较一组欧洲铁路公司在垄断的情况下，假设双寡头垄断的情况下的效率水平。更具体地说，目的是测试这些公司的经营成本函数是否是次可加性的。当一个企业生产所有相关的产出向量比两个或两个以上的企业便宜时，成本函数是次加性的。为此，将使用Evans和Heckman（1984）开发的测试。它被美国电话公司贝尔系统应用于评估本地和长途服务分开管理的便利性。结果表明，至少对于规模较大的公司，效率的提高（以较低的成本衡量），将获得从目前的公司在两个不同的公司规模较小的分离。此外，当这两家新公司专门从事客运或货运的生产时，效率的提高会更大。
The objective of this paper is the comparison of the efficiency levels for a set of European rail companies in monopoly situations with respect to hypothetical duopoly situations. More specifically, the aim is to test whether the operating costs function of such companies is subadditive. A cost function is subadditive when a single firm can produce all relevant output vectors cheaper than two or more firms. In order to do so the test developed by Evans and Heckman (1984) will be used. It was applied for the American phone company Bell System to assess the convenience of separating the management of local and long-distance services. The results indicate that at least for the companies of a greater size, an efficiency increase (as measured by lower costs), would be obtained from the separation of the current companies in two different companies of a lower size. Besides, these efficiency gains are greater when the two new companies specialize their production, either on passenger or on freight traffic.