Auckland supermarkets are selling baby milk formula to Chinese exporters thousands of cans at a time while rationing them to other shoppers, unbeknown to authorities.

Fonterra is being asked to hand over its raw milk price calculations to the Commerce Commission, as it looks into whether a full milk price inquiry is justified.

Foodstuffs Wellington is making more than 100 people redundant in the lower North Island as part of a restructuring to save $4 million a year.

Agriculture Minister David Carter has ruled out government intervention to keep milk prices down, saying high international prices will benefit the New Zealand economy.

Foodstuffs will pump $45 million into the Christchurch economy with a major extension to its Hornby distribution facility.

Salad and spinach products sold in three supermarket chains are being recalled because of fears they contain a food-poisoning bacteria.

The country's two supermarket giants have taken different approaches to dealing with the rise in GST, which comes into effect tomorrow.

Energy-saving lightbulb maker survived tough times thanks to keeping a close eye on cashflow.

Nearly 400 homes in Kaiapoi and Pines Beach are under restricted access or considered unsafe as a result of Saturday's quake.

Supermarket chains are counting millions of dollars in damaged stock as they ship in groceries to cover shortages and access lost to distribution centres.

It's music to the ears of shoppers - competition is forcing the two big supermarket chains to keep a lid on prices.