This document discusses the enhanced cooperation between the competition authorities of Australia and New Zealand, the ACCC and NZCC. It provides background on the long history of economic cooperation between the two countries dating back to 1983. In 2009, a single economic market framework was agreed to that proposed three outcomes, including cross-appointments of associate members between the ACCC and NZCC to further cooperation. This led to the inaugural cross-appointments in 2010 between the chairs of the two organizations. The cross-appointments have benefited merger reviews by deepening cooperation at staff levels and working to achieve greater alignment in analytical frameworks and effective remedies. An initial three year review found positive feedback and the authorities are committed to ongoing review and future arrangements