"The level of competition, taking into account existing regulation arrangements, means that intervention under Part 4 of the Commerce Act is not possible," commission chairman Mark Berry said yesterday.
But he said the commission was still dealing with complaints laid under Part 2 of the act, which prohibits parties with substantial market power interfering with competition.
Fonterra Shareholders Council chairman Simon Couper described yesterday's announcement as "vindication" for all Fonterra farmers.
He found it "ludicrous" that the co-operative had been labelled as anti-competitive. There were at least 25 other processors in the country whose production had risen by 400 per cent in the past decade.
The Commerce Commission intended reviewing complaints that a move by Fonterra Brands New Zealand (FBNZ) to freeze the price of liquid milk sold to retailers might have breached the Commerce Act.
In February, FBNZ decided to freeze liquid milk prices for the rest of the year, meaning it would absorb the impact of further commodity price rises. It was ironic that a voluntary price freeze could be viewed as breaching legislation which had the "benefit of consumers" at its core, Mason said.
In June, three government ministries - Agriculture and Forestry, Economic Development and Treasury - announced they had launched a separate inquiry into prices. Otago Daily Times