We investigate the motives of pro-social behavior in collective decisions in an economic experiment. It compares individual behavior in private and collective decisions in a unified experimental setup. Subjects are given an individual endowment and have to decide how much of it to donate to...

We analyze a drastic price increase in the German auction market for reserve power, which did not appear to be driven by increased costs. Studying the market structure and individual bidding strategies, we find evidence for collusive behavior in an environment with repeated auctions, pivotal...

We analyze the substitutability between brick-and-mortar stores and e-Commerce. Using a novel data set on the German book market we find that between 26 and 55% of the decrease in book sales from 2014-2017 can be explained by the decrease in the number of bookstores. This indicates that...

We empirically analyze the role of e-Commerce and brick-and-mortar retailers in discovering new bestsellers in the book market, using the German market as an example. Using an AR(1)-Process, we find that when a title becomes a bestseller sales increase in e-Commerce and decrease in...

Curfews present the most restrictive measure aiming to fight the spread of the COVID 19-pandemic. A somewhat weaker form are night time curfews. Night time curfews were imposed all over the world (e.g. USA, France, Germany or Argentina) and are still in force in many countries and have been even...

This article investigates the efficiency of the roll-out of Covid-19 vaccinations when vaccines are scarce. Using Germany as an example, we find considerable differences across federal states in terms of efficiency, defined as the ability to get most vaccinations out of a given number of...

This paper focuses on incentives to invest in research and development (R&D) in vertically related markets. In a bilateral duopoly setup, we consider how process R&D incentives of the firms in both upstream and downstream market depend on the intensity of simultaneous interbrand and intrabrand...

This paper analyzes exclusionary conduct of platforms in two-sided markets. Motivated by recent antitrust cases against shopping centers introducing radius restrictions on their tenants, we provide a discussion of the likely positive and normative effects of exclusivity clauses, which prevent...

In the beginning of fixed network liberalisation in Europe in the late 1990s, the main concern of regulators was to lower calls prices. This was done by introducing wholesale regulation and promoting service based competition. Some years later, the concern of some regulators turned from too high...

This paper looks at the effects of different forms of wholesale and retail regulation on retail competition in fixed network telephony markets. We explicitly model two asymmetries between the incumbent operator and the entrant: (i) While the incumbent has zero marginal costs, the entrant has the...