Using the regional productivity of the Reichspost, the postal service of the German Empire, I investigate whether a public monopolist operates with uniform regional productivity. Using DEA efficiency scores we derive the relative productivity of the post, telegraph and telephone sectors from 1891 to 1908. Results show a fairly stable system with substantial raw productivity differences between postal districts and that the expansion of the service offset technological productivity increases for the mail service.

中文翻译：

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统一的服务，统一的生产力？德意志帝国邮政、电报和电话服务的区域效率

使用德意志帝国邮政服务 Reichspost 的区域生产力，我调查了公共垄断者是否以统一的区域生产力运作。使用 DEA 效率得分，我们推导出了 1891 年至 1908 年邮政、电报和电话部门的相对生产力。结果显示一个相当稳定的系统，邮政区之间的原始生产力差异很大，并且服务的扩展抵消了邮件技术生产力的增加服务。