Merger Simulations of Unilateral Effects : What Can We Learn from the UK Brewing Industry?
I discuss the use of simulation techniques to evaluate unilateral effects of horizontal mergers and the pitfalls that one can encounter when using them. Simple econometric models are desirable because they can be implemented in a short period of time and can be understood by non experts. Unfortunately, their predictions are often misleading. Complex models are more reliable but they require more time to implement and are less transparent. The use of merger simulations and the sensitivity of predictions to modeling choices is illustrated with an application to mergers in the UK brewing industry. There have been a number of brewing mergers that have changed the structure of the UK market, as well as proposed but unconsummated mergers that would have had even more profound effects. I assess two of them: the successful merger between Scottish&Newcastle and Courage and the proposed merger between Bass and Carlsberg–Tetley.
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