Trade Minister Tim Groser says New Zealand is partway through a process of restoring its reputation in the world as a safe food producer after Fonterra's whey product contamination scare and subsequent product recall last month.

Riding a volatile currency is a perennial bugbear for New Zealand exporters, but overcoming that problem has created resilient businesses, says one expert.

Separate bilateral negotiations on market access within the Trans Pacific Partnership talks relate only to transitional paths, not to the end point of a single tariff schedule for all the partners, says Trade Minster Tim Groser.

National Australia Bank boss Cameron Clyne believes the key to tapping into trade in China is patience.

The near-term outlook for the global economy is sluggish, the OECD says, as a widespread slowdown in emerging economies offsets brighter prospects for advanced ones.

Export and import prices moved in New Zealand's favour in the June quarter, but the effect was swamped by lower export volumes and rising imports.

World-leading Kiwi exporters need to champion New Zealand more ardently in foreign markets as the country is still perceived by some as being slow to innovate.

New Zealand has pushed Fonterra's case in meetings with the Sri Lankan government following a tumultuous month which saw the dairy giant temporarily shut down its Sri Lankan operations.

Baby formula company Nutricia and anyone else considering legal action over the Fonterra contamination scare should wait until inquiries into the incident are completed, Prime Minister John Key says.