Abstract
Under the principle of the failing firm defence a merger that would be blocked due to its harmful effect on competition could be nevertheless allowed when (i) the acquired firm is actually failing, (ii) there is no less anticompetitive alternative offer of purchase, (iii) absent the merger, the assets to be acquired would exit the market. We focus on potential anticompetitive effects of a myopic application of the requirement (iii) by studying consequences of a horizontal merger on entry in a Cournot oligopoly with a failing firm. Entry is deterred if the merger is cleared and, when the industry is highly concentrated, consumer welfare is higher under a prohibition because long-run gains due to augmented competition exceed short-run losses due to shortage of output.