Kiwi consumers could finally see butter prices fall, thanks to increased global dairy production.   New research from Rabobank shows EU, UK, and US production has been surging, pushing down global prices.  Fonterra's already forecasting a lower farmgate payout than last season.  Fonterra Co-operative Council Chair John Stevenson told Heather du Plessis-Allan the change could be good news for supermarket shoppers.  He says if the surge continues, there'll be an impact on our store shelves.  LISTEN ABOVE  See omnystudio.com/listener for privacy information.