Accounting for network operators' heterogeneity is of crucial importance for regulators. In contrast to observed heterogeneity, the consideration of unobserved differences is far more challenging. Most estimation models try to account for unobserved factors that impact the network operators'...

How can small and medium-sized German postal providers ensure nationwide geographical coverage without the aid of the former monopolist? A closer look at the industry revealed that postal providers in Germany engage in different types of cooperation in order to expand their geographical coverage...

I investigate how political uncertainty influences corporate investment decisions employing a unique panel dataset of German manufacturing firms. I use data on firms' self-reported investment realizations, plans and revisions. The firm-specific user cost of capital captures the current...