"They're not convinced at the moment that they're getting a fair price."
Mr Key said he did not believe Fonterra was ripping off New Zealanders, and that there was evidence of that in work the Government had previously done on the issue.
Agriculture Minister David Carter yesterday said there would be "some value" in holding a select committee inquiry.
"I think a select committee inquiry could actually delve in and, at the end of the day, if they actually demonstrated to New Zealand there's a wide variety of pricing at the retail sector for people to buy milk, that would be quite useful," Mr Carter told TVNZ's Q and A programme.
There was a lot more variation in the retail price of milk than people realised, and that would be important for the select committee to show, he said.
- NZPA