Chamber of Commerce chief executive Dave Burnett said the New Zealand economy was driven by agriculture and there would be a ripple effect from the regions into the cities.
Farmers would close their wallets, he said.
"It's a big decrease and a substantial reduction on what farmers have been used to when it was $8.40. The new season only started on June 1 so even though farmers are still receiving higher payouts as they adjust there will be less spent on capital equipment and general farm maintenance."
Te Puke company Bradstreet Contractors lost $450,000 during the drought and it had not yet clawed that back.
Owner Peter Bradstreet said he bought new equipment this year, including a new tractor, and time would tell if that was a wise decision.
"It's a guessing game all the way through and a big call whether it's going to be worth it, you just hope it's not going to fall over because you are spending hundreds of thousands of dollars."
DairyNZ chief executive Tim Mackle said volatility was part of everyday life and dairy farmers would be conservative when making farm decisions this season.
Federated Farmers dairy chairman Andrew Hoggard said farmers would have to cut their cloth accordingly and watch costs closely.
DairyNZ economists estimate the reduced payout could cut national income by $1.8 billion this dairy season - an average per farm loss of about $150,000. The Bay of Plenty was expected to lose $126 million.