The National government would easily be re-elected on the back of the Trans-Pacific Partnership Agreement (TPPA) if an election were held this week, according to a poll of nearly 900 people.
October's Roy Morgan poll, taken yesterday, says support for National has risen 5.5 percent to 50 percent, well ahead of a potential Labour/Greens alliance tally of 40.5 percent (down 5.5 percent).
The pollsters put the rise to New Zealand being one of 12 Pacific Rim countries to earlier this month sign a trade deal that now covers 40 percent of the world's economy.
"The successful conclusion to the TPPA negotiations is a major milestone for New Zealand Prime Minister John Key, and since the conclusion of the trade deal the New Zealand stockmarket has increased strongly," Roy Morgan executive chairman Gary Morgan said.
The parties in coalition with the National government were changed slightly, with the Maori Party 0.5 percent (down 1 percent), ACT 0.5 percent (unchanged) and United Future 0 percent (down 0.5 percent).
Of the opposition parties, Labour support was down 2 percent to 29 percent, and the Greens down 3.5 percent to 11.5 percent. Support for NZ First increased 1 percent to 6.5 percent.
However, Roy Morgan noted that despite National's increase in support, its Government Confidence Rating had fallen 6.5 points to 122 points in October.
A decreasing majority of electors - 53 percent (down 5 percent) - say New Zealand is heading in the right direction compared with 31 percent (up 1.5 percent) who say the country is heading in the wrong direction.