Die COVID-19-Pandemie ist das beherrschende Thema der letzten 18 Monate gewesen. Die Impfung gegen COVID-19 ist nach wissenschaftlicher Erkenntnis als der Ausweg anzusehen. Der Beitrag verdeutlicht, dass die mit COVID-19 zusammenhängende Impfstrategie in drei Phasen einzuteilen ist, wobei...

The European Commission has proposed a new regulatory tool for the governance of digital markets. The Digital Markets Act (DMA) intents to limit the market behavior of so-called gatekeeper companies to ensure contestable and fair digital markets. We review the provisions of the DMA both from a...

In this comprehensive review of ex-post merger studies price effects of horizontal transactions are evaluated. By combining and further analyzing the results of 52 retrospective studies on 82 mergers or merger-like transactions it can be shown that the industry alone is no strong indication for...

Der Beitrag analysiert mögliche spezielle Wettbewerbsprobleme, die in Medienmärkten auftreten können, und ihre Implikationen für die Wettbewerbsordnung. Es wird beleuchtet, ob klassische medienspezifische Wettbewerbsprobleme in der Digitalwirtschaft noch bestehen und welche neuen...

In this paper, we show that a concept of aggregation can hold in large network games with linear best replies. Breaking up large networks into smaller subnetworks, which can be replaced by representative players, leads to a coarse-grained description of strategic interactions. This method of...

This paper proposes new centrality measures to characterise the 'key class', when agents in a network are sorted into role-equivalent classes, such that its removal results in an optimal change in the network activity. The notion of role-equivalence is defined through the graph-theoretical...

This paper investigates a model of default in financial networks where the decision by one agent on whether or not to default impacts the incentives of other agents to escape default. Agents' payoffs are determined by the clearing mechanism introduced in the seminal contribution of Eisenberg and...

This research employs two alternatively framed but formally equivalent discrete choice ex- periments that examine UK consumer preferences regarding chlorine washed chicken. One is framed in a common purchase format, the other employs a format that endows respondents with a voucher that they can...

In December 2020, new regulation of digital markets was proposed by European Commission. It specifically addresses main concerns raised by business behavior of operators of core services in their gatekeeping positions. However, voice assistants (or digital personal assistants, DPAs, e.g. Apple's...

The present paper uses a jont stated preference (SP) and revealed preference (RP) model in order to estimate the willingness to pay (WTP) for the organic attribute among other key environmental attributes in chicken meat. The stated preference model is based on the respondent's choice from...