We study the 1956 consent decree against the Bell System to investigate whether patents held by a dominant firm are harmful for innovation and if so, whether compulsory licensing can provide an effective remedy. The consent decree settled an antitrust lawsuit that charged Bell with having...

How does antitrust enforcement against patent-based monopolies affect innovation? I address this question by empirically studying the US antitrust case against Xerox, the monopolist in the market for plain-paper copiers. In 1975, Xerox was ordered to license all its copier-technology patents in...

This paper explores the connection between the proliferation of cashless, or e-money, payments and value-added tax (VAT) compliance. We present both visual and descriptive evidence that illustrates a negative correlation between e-money use and VAT evasion, proxied by the VAT compliance gap for...

Die Entwicklung des Robo Advice bietet bankenunabhängigen FinTechs die Chance, sich Anteile am Markt für Anlageberatung, Vermittlung und Verwaltung von Finanzinstrumenten zu erobern. Dauerhaft werden sie sich allerdings nur dann als unabhängige Anbieter behaupten können, wenn ihnen alle...

Health care markets in developed countries have become increasingly concentrated, while at the same time there has been an increasing trend of mergers and acquisitions (M&As) in these markets. I study the impact of M&As in the diagnostic procedure market, a market that is an important part of...

A central motivating factor for studying price markups is their effect on consumer welfare. Reported estimates of (firm-level) price markups in the literature, however, are often focused on industry or cross-country comparisons. These treat different industries equally rather than based on how...

We analyze the effects of the 1984 breakup of the Bell System on the rate, diversity, and direction of US innovation. In the antitrust case leading to the breakup, AT&T, the holding company of the Bell System, was accused of using exclusionary practices against competitors. The breakup was...