Leere Bahnhöfe, verwaiste Straßen: Der Verkehrssektor gehörte zweifellos zu den markantesten Ausprägungen der COVID-19-Pandemie. Nachdem der gesellschaftliche Krisenzustand seit Frühjahr 2023 offiziell als überwunden gilt, untersucht die vorliegende Studie, wie drei Jahre Pandemie das...

Leere Busse, ausgefallene Züge, verlassene Flughäfen, Menschen tauschen Tipps zum Spazierengehen aus. Die Mobilität ist in COVID-19-Zeiten stärker in den öffentlichen Fokus gerückt. Nicht zuletzt der Zusammenhang von Mobilität und Ansteckungsraten bringt Mobilitätskennwerte in...

We investigate the causal effect of patent rights on cumulative innovation, using large-scale data that approximate the patent universe in its technological and economic variety. We introduce a novel instrumental variable for patent invalidation that exploits personnel scarcity in post-grant...

Hidden Champions (HCs) are firms unknown to the wider public, but global leaders in the niche markets they serve. This paper looks at distinctive features of these firms, focusing on their dynamic capabilities. Employing a unique data base on German firms, we identify a representative sample of...

Previous research has expressed concerns about firms engaging less in basic research. We contribute to this debate by studying trends in the scientific publishing activities of firms located in Germany. Our results do not confirm a declining trend in raw numbers with numbers indicating that...

Artificial Intelligence (AI) represents a set of techniques that enable new ways of innovation and allows firms to offer new features of products and services, to improve production, marketing and administration processes, and to introduce new business models. This paper analyses the extent to...

This paper tests for the sensitivity of R&D to financing constraints conditional on restrictions in external financing. Financing constraints of firms are identified by an exogenously calculated rating index. Restrictions in external financing are determined by (i) the specific time period...