This paper studies competition in the German market for mobile telecommunications, motivated by recent suggestions that T-Mobile and Vodafone possess a position of collective dominance. Allegedly, their position of joint dominance is secured through a combination of first-mover advantages and...

We explore whether buyer groups, in which firms legally purchase inputs jointly, facilitate collusion in the product market. In a repeated game, abandoning the buyer group altogether or excluding single firms from them constitute more severe credible threats, hence, in theory buyer groups...

We explore whether lawful cooperation in buyer groups facilitates collusion in the product market. Buyer groups purchase inputs more economically. In a repeated game, abandoning the buyer group altogether or excluding single firms constitute credible threats. Hence, in theory, buyer groups...

Bei der Besteuerung nicht oder nur begrenzt handelbarer Dienstleistungen (wie z.B. lokale Postdienstleistungen) entfällt der Anpassungsdruck des internationalen Steuerwettbewerbs weitgehend, sodass etwaige Wettbewerbsverzerrungen insbesondere zwischen verschiedenen inländischen...