distinguishable types. This contribution explains absolute market power (single-firm monopoly and dominance), collective market power … market entries to discipline the behavior of powerful incumbents on monopoly or dominance markets. Recently, contestability …

-shape in the success probability. Since even at the peak entry is rather unlikely, the persistence of the monopoly is high …. -- Persistence of Monopoly ; Efficiency Effect ; Replacement Effect ; Stochastic Innovations …