Ralf Dewenter Livres

Media platforms typically operate in a two-sided market, where advertising space serves as a major source of revenues. However, advertising volumes are highly volatile over time and characterized by cyclical behavior. Firms' marketing expenditures in general are far from stable. Due to planning of future issues as well as financial planning, platforms have to forecast the demand for advertising space in their future issues. We use structural time series analysis to predict advertising volumes and compare the results with simple autoregressive models

Increasing horizontal as well as vertical transparency in oligopolistic markets can be advantageous for consumers, due to reduced search costs. However, market transparency can also affect incentives to deviate from collusive agreements and the punishment by rival firms in the market. Using a panel of 27 European countries, we analyze the impact of increased market transparency via the introduction of a market transparency unit for fuels in Germany. Applying a difference-in-differences approach, we find evidence that both gasoline and diesel prices have increased. While consumers may be better off using a retail price app for fuels, gas stations are also able to compare prices at almost no cost

Die Festschrift für Jörn Kruse enthält Beiträge aus den Bereichen Medien- und Telekommunikationsökonomik, Wettbewerbspolitik, Sportökonomik, Energiepolitik sowie allgemeine Fragen der Wirtschafts- und Ordnungspolitik. Sie reflektieren nicht nur den breiten Schaffenskreis von Jörn Kruse, sondern auch seinen Einfluss auf die Volkswirtschaftslehre einerseits, aber auch auf benachbarte Disziplinen wie insbesondere die Betriebswirtschaftslehre und die Medienwissenschaften. Zum Autorenkreis gehören aktuelle und frühere Schüler sowie heutige und frühere Kollegen und Weggefährten. Mit Beiträgen von: Theresia Theurl, Günter Knieps, Ingo Vogelsang & Steffen Hoernig, Ulrich Stumpf, Claudia Loebbecke & Stefan Schepers, Justus Haucap & Christiane Kehder, Claudia Fantapié-Altobelli & Sandra Meister, Björn Frank, Wolfgang Seufert, Ralf Dewenter & Ulrich Heimeshoff, Oliver Budzinski & Anika Müller, Björn Kuchinke & Ninja Lehnert, Jörn Quitzau, Norbert Eickhof, Markus Hessler & Ina Loebert, Wolfgang Kerber & Severin Frank, Ulrich Schwalbe, Mathias Erlei & Eduard Braun.

This note analyzes the existence of a possible media bias by determining the impact of automobile manufactures' advertisements on the probability that German car magazines review their products. By accounting for possible endogeneity, we find a positive impact of advertising volumes on test probability

Increasing price levels, high price volatility and the suspicion of collusive behavior are important topics of public debates on competition in retail gasoline markets in many countries. Several governments and competition authorities introduced fuel price regulations in form of restrictions on the frequencies of fuel price changes per day. We present empirical evidence of the effects of fuel price regulation in Austria and Western Australia using difference-in-differences methods to estimate treatment effects of the implementation of such pricing rules. Our estimates provide evidence that fuel price levels in Austria decreased after implementation of regulation. However, we cannot find robust significant effects of regulation on fuel price levels in Western Australia