Nicola Willis is defending her decision to seek answers from Fonterra about its prices. 

The price of butter has almost doubled in the past 14 months because Asia is demanding more, and Europe is producing less. 

Fonterra is ruling out selling butter to New Zealanders at a lower price than it makes overseas. 

But Willis told Mike Hosking she has no regrets about raising the issue with the dairy co-op in the first place. 

She says she can't dismiss an issue lots of New Zealanders are talking about. 

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