Google is supposed to be the dominant player in most search markets around the world. But what is a search market? To calculate a market share of 90% or more, it has to be clear what the denominator is: Does the search market also include product search and therefore Amazon and eBay or the...

Das Vorhaben einiger Breitbandnetzbetreiber, Content Provider fuer die Durchleitung der Inhalte zu bepreisen, hat in den USA eine erbitterte Debatte darueber hervorgerufen, ob und inwiefern Netzneutralitaet im Internet einer gesonderten Regulierung bedarf. Es wurde dabei vor allem vor einer...

There is a wide range of magazines, newspapers, TV shows, and websites providing information on products based on product reviews or expert opinions. A natural question is, whether these reviews and expert opinions have effects on product sales. There is a small but growing literature in...

This paper analyses the income effect of the participation in elite sports. To quantify the average difference in the monthly net income of former elite athletes and non-athletes we estimate sample average treatment effect scores (SATT) by using covariate nearest-neighbour matching (CVM). While...

This paper investigates the existence of a possible media bias by analyzing the impact of auto- mobile manufacturer’s advertisements on automobile reviews in a leading German car maga- zine. By accounting for both endogeneity and sample selection using a two-step procedure, we find a positive...

Media and especially mass media like newspapers or magazines are characterised by a number of peculiarities which are interesting from both a theoretical and empirical point of view. The interrelationship of reader and advertising markets, high sunk costs and large economies of scale are typical...

This paper analyzes the impact of different payment regimes for mobileto- mobile off-net calls on the diffusion of mobile telephony, using data on 84 countries from all over the world. Since the decision whether or not countries are likely to switch from RPP to CPP is not independent from...

Die aktuelle Diskussion um die Novellierung der deutschen Pressefusionskontrolle macht deutlich, welche Relevanz medienoekonomische Fragestellungen haben. Was jedoch bei dieser Diskussion haeufig vernachlaessigt wird, ist die intensive Betrachtung der oekonomischen Besonderheiten von...

This paper provides an empirical analysis on the effectiveness of incentives when pay-offs were changed. Using data on Portuguese first division football matches the effects of the introduction of the so called three-point rule are analyzed applying panel count data techniques.

Das vorliegende Papier erlaeutert anhand eines einfachen Modells der Zeitungsmonopole, die Relevanz der Theorie der zweiseitigen Maerkte fuer den Mediensektor. Im Mittelpunkt stehen dabei die indirekten, zweiseitigen Netzwerkeffekte, die sowohl einen zweiseitigen Markt begruenden, als auch fuer...