Mexico, the world's 13th-biggest economy, has accepted an invitation to join regional trade negotiations including New Zealand and Australia in a deal that could free up market access hindered by the 1994 North American Free Trade Agreement.
Mexican President Felipe Calderon and United States President Barack Obama told reporters at the Group of 20 leaders' summit that Mexico would join the nine countries holding Trans Pacific Partnership talks after signalling its desire to join last November.
Australia, Brunei, Chile, Malaysia, New Zealand, Peru, Singapore, the US and Vietnam hope to create a free-trade bloc spanning the Asia-Pacific region that extends into aligning regulatory settings and removing tariffs and quotas.
The addition of Mexico means New Zealand may be able to eliminate trade barriers originating from Nafta.
New Zealand exports to Mexico have been worth $116.2 million this year and totalled $414 million last year.