-2014 period, we evaluate how consistently arguments related to structural market parameters were applied over time. Using non …-parametric machine learning techniques, we find that the importance of market shares and concentration measures has declined while the …

market reactions. We focus on four different dimensions of effectiveness: 1) legal certainty, 2) decision errors, 3 …

This paper applies an intuitive approach based on stock market data to a unique dataset of large concentrations during … rents accruing due to the increased market power observed around the merger announcement are reversed by the antitrust … events' competitive effects, we explicitly control for the market expectation about the outcome of the merger control …

policy effectiveness, which is based on standard oligopoly theory and makes use of stock market reactions as an external …