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In this paper we study how the coexistence of access regulations for legacy (copper) and fiber networks shapes the incentives to invest in network infrastructure. To this end, we develop a theoretical model explaining investment incentives by incumbent telecom operators and heterogeneous entrants and test its main predictions using panel data from 27 EU member states over the last decade. Our theoretical model extends the existing literature by, among other things, allowing for heterogeneous entrants in internet access markets, as we consider both other telecom and cable TV operators as entrants. In the empirical part, we use a novel data set including information on physical fiber network investments, legacy network access regulation and recently imposed fiber access regulations. Our main finding is that more stringent access regulations for both the legacy and the fiber networks harm investments by incumbent telecom operators, but, in line with our theoretical model, do not affect cable TV operators.

 

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Theories of innovation and technical change posit that inventions that combine knowledge across technology domains have greater impact than inventions drawn from a single domain. The evidence for this claim comes mostly from research on patented inventions and ignores failed patent applications. We draw on insights from research into institutional gatekeeping to theorize that, to be granted, patent applications that span technological domains must have higher quality than otherwise comparable, narrower applications. Using data on failed and successful patent applications, we estimate an integrated, two-stage model that accounts for this differential selection. We find that more domain-spanning patent applications are less likely to be approved, and that controlling for this differential selection reduces the estimated effect of knowledge recombination on innovative impact by about one-third. By conceptualizing the patent-approval process as a form of institutional gatekeeping, this paper highlights the institutional underpinnings of and constraints on the innovation process.

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