Topic Markets

Physician effects in antibiotic prescribing: Evidence from physician exits

This is an online seminar using Webex. You will receive the login data with the invitation to the talk. Abstract:   Antibiotic resistance is a severe problem within our current health systems. One of the main strategies to combat the rise of antibiotic resistance is to improve individual physicians' antibiotic prescribing practices. However, this strategy requires that differences in...

Airbnb and Rents: Evidence from Berlin

This is an online seminar using Webex. You will receive the login data with the invitation to the talk. Abstract:   Cities worldwide have regulated the peer-to-peer short-term rental market claiming that those markets remove apartments from the long-term housing market, causing an increase in rents. However, at the time many of these policies were passed, empirical evidence for or...

Big Tech Acquisitions in the Google Play Store

This is an online seminar using Webex. You will receive the login data with the invitation to the talk. Abstract:  In the last ten years, Google, Apple, Facebook, Amazon, and Microsoft (GAFAM) acquired more than 400 companies, predominantly in the technological sector. Competition authorities did not scrutinize most of these transactions, as they did not reach the traditional thresholds,...

Common Ownership, Markups and Productivity: Evidence from European Firms

This is an online seminar using Webex. You will receive the login data with the invitation to the talk. Abstract:  This paper analyzes the relationship between common ownership – when two firms are partially held by the same investor – and markups. Combining firm-level financial data from Europe with ownership data of publicly listed firms, we structurally estimate production...

Modeling Geographical Preferences to Study the Welfare Implication of Airbnb's Presence in the Short-Term Accomodation Market

Abstract:  We study competition between Airbnb and hotel accommodations in Paris in 2017 to assess the welfare implications of Airbnb’s presence on hotels and travelers. The existing literature on the subject exclusively uses across city variation in Airbnb diffusion. Consequently, it does not take into account that the location of an accommodation within a city might be an important...

Market Concentration in Europe: Evidence based on Antitrust Markets (cancelled)

Abstract:  An increasing body of empirical evidence has documented trends to risen concentration, profits, markups, and market power in many industries across the world since the 1980s. Several factors – such as globalisation, digitisation, the increased role of intangible assets and sunk costs, as well as M&A activity and the (under)enforcement of merger control– have been...

Battling Antibiotic Resistance: Can Machine Learning Improve Prescribing?

Abstract:  Antibiotic misuse due to prescribing under diagnostic uncertainty is a leading driver of antibiotic resistance. We investigate the magnitude and mechanisms by which machine learning predictions can enable policies that reduce antibiotic misuse. Building on predictions from administrative data on urinary tract infections in Denmark, we evaluate counterfactual policies that replace...

Common Ownership in the US Pharmaceutical Industry: A Network Analysis

We investigate patterns in common ownership networks between firms that are active in the US pharmaceutical industry for the period 2004-2014. Our main findings are that “brand firms” — i.e. firms that have R&D capabilities and launch new drugs — exhibit relatively dense common ownership networks with each other that further increase significantly in density over time, whereas the network of “generic ...

Learning from Data and Network Effects: The Example of Internet Search

The rise of dominant firms in data driven industries is often credited to their alleged data advantage. Empirical evidence lending support to this conjecture is surprisingly scarce. In this paper we document that data as an input into machine learning tasks display features that support the claim of data being a source of market power. We study how data on keywords improve the search result quality ...

Evaluation Support Study on the EU Rules on State Aid for Access to Finance for SMEs: Final Report