Endogeneity in network formation hinders the identification of the role social networks play in generating spillovers, peer effects and other externalities. This paper tackles this problem and investigates how the link network between articles on the German Wikipedia influences the attention and...

We develop a model of R&D competition between an incumbent and a potential entrant with network externalities and durable goods. We show that the threat of entry eliminates the commitment problem that an incumbent may face in its R&D decision due to the goods? durability. Moreover, a potential...

This paper analyzes the impact of network externalities on R&D competition between an incumbent and a potential entrant. The analysis shows that the incumbent always invests more than the entrant in the development of higher quality network goods. However, the incumbent exhibits a too low level...

This paper studies the incentives to undertake uncertain R&D initiatives in a dynamic duopoly network industry. It is shown that network externalities positively affect the incentives to invest in R&D. In the model, competition resembles a preemption race and, therefore, market performance...

I quantify spillovers of attention in a network of content pages, which is challenging, because such networks form endogenously. I exploit exogenous variation in the article network of German Wikipedia to circumvent this problem. Wikipedia prominently advertises one featured article on its main...

Peer influence through word-of-mouth (WOM) plays an important role in many information systems but identification of causal effects is challenging. We identify causal WOM effects in the empirical setting of game adoption in a social network for gamers by exploiting differences in individuals'...

Much of the empirical literature analysing the relation between environmental innovation and competitiveness has focused on the question whether 'it pays to be green'. We differentiate between different types of environmental innovations, which will be disentangled in those aiming at reducing...

Die schwere Wirtschaftskrise 2008/09 hatte substanzielle Auswirkungen auf die Innovationstätigkeit der deutschen Wirtschaft. Die Umsatz- und Gewinneinbußen führten zu einem kräftigen Rückgang der Innovationsausgaben. Davon waren primär Investitionen für neue Produkte und verbesserte...

Recent Internet technologies and web-based applications, such as social software, are being increasingly applied in firms. Social software can be employed for knowledge management and for external communication enabling access to internal and external knowledge. Knowledge in turn constitutes one...

Globalization has led to exciting new business opportunities around the globe. Still, national and cultural boundaries have not evaporated into a "borderless world". Several studies have identified so-called liabilities of foreignness that arise from a lack of embeddedness and roots in the host...