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 …

outcome in terms of liquidity and (generally) welfare compared to the case of an unregulated monopoly. Controlling entry or …

likely are entry restrictions, whereas a greater relevance of firms makes a monopoly more probable. The nature of entry …