An overview of key issues in relation to merger control under the Commerce Act 1986 for business acquisitions which would have, or would be likely to have, the effect of substantially lessening competition in a market in New Zealand. It covers the regulatory framework, procedure and time frames for clearance or authorisation of mergers by the Commerce Commission. It also covers publicity and confidentiality issues, third party rights, undertakings, remedies, penalties, appeals, inter-agency cooperation and recent mergers and cases