This collection of papers brings together the lessons learned from New Zealand's Commerce Act 1986 and its principal subsequent amendments. Providing concise analysis of those amendments, and of topics relating to the original Commerce Act, this work pays particular attention to the introduction of economic regulation into the electricity and telecommunication markets. Casting a wide net over many major issues in New Zealand's economy, this volume outlines the impact of the Ministry of Economic Development on the strength and effectiveness of the Commerce Act, international perspectives on competition law and methods for administering penalties in competition law cases.