This paper investigates the merger wave hypothesis for the US and the UK employing a Markov regime switching model. Using quarterly data covering the last thirty years, for the US, we identify the beginning of a merger wave in the mid 1990s but not the much-discussed 1980s merger wave. We argue...

Most often, the competition authorities approve combinations based on the tradeoff between the expected efficiency gains and the likely effect on market power creation. However, the realities may be different from the expected synergy creation since merger regulations are ex ante in nature. The...