Labour and the Greens are calling on the Government to control the exchange rate.
They say exporters are being crippled by the high kiwi dollar and businesses will go bust if the Reserve Bank isn't given new intervention powers.
Labour's finance spokesman David Parker says simple changes like broadening the bank's objectives beyond just controlling inflation, and giving exporters a voice on its board, would help.
Greens co-leader Russel Norman has a Statistics NZ survey showing 45 percent of businesses cite the high exchange rate as a major barrier to growth, while only 13 percent say foreign tariffs are a problem.
"The Government has spent too much time pursuing free trade agreements when it's the high and volatile kiwi dollar that's affecting export businesses the most," he said.
Dr Norman says there's no quick fix, which is why there has to be a policy debate.
Prime Minister John Key, who is visiting Indonesia, said on Tuesday the dollar was high because of weak US and European economies.
He told reporters the Government was considering "what we can do to resist a rising exchange rate".
Mr Parker says making observations on the problem don't help.
"Change is obviously needed, but despite his posturing John Key's policies remain unchanged and inadequate."
NZN