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UPDATE 2-Ardern to be next NZ prime minister, spelling big change for economy

* Ardern says to stick to campaign promises on trade, central bank

* Says has offered Peters deputy minister role, he is considering

* Government announcement drives NZ dollar lower (Recasts and updates throughout)

WELLINGTON, Oct 19 (Reuters) - New Zealand's next prime minister will be Jacinda Ardern, whose Labour party won the support of a small nationalist party to form the government, spelling big changes for a small but open economy, whose currency hit a 4-1/2-month low on the news.

Labour indicated it would pursue plans to change the central bank's mandate, seek to renegotiate the Trans-Pacific Partnership trade deal and prioritize an effort to ban foreign ownership of certain types of housing.

"It is an absolute honour and a privilege to have the ability to form a government for all New Zealanders," said Ardern, who will be the youngest prime minister in more than 150 years, ending the conservative National Party's decade in power.

"These negotiations have been robust, but there has been more that has united the parties than has divided."

The New Zealand dollar fell more than one percent on the news that Labour would lead a government with backing from New Zealand First, as markets worried it would usher in more protectionist policies.

Ardern, a political ingenue whose victory marks the emergence of another youthful global leader promising to shake up the status quo, said she had offered the position of her deputy to Winston Peters, the leader of New Zealand First, who was considering it.

"Far too many New Zealanders have come to view today's capitalism, not as their friend, but as their foe," Peters told a news conference.

"Weve had to make a choice for a modified status quo, or for change," he said. "We choose a coalition government of New Zealand First with Labour."

Peters said new policy announcements would be up to Ardern, but gave a foretaste of what may come by saying he expected fewer immigrants to be allowed into New Zealand.

He had agreed with Labour to build tens of thousands of affordable homes, he added.

"This shows that Winston Peters wants to make some radical changes in New Zealand," said Bryce Edwards, political analyst at Critical Politics in Wellington.

"He has always been an anti-establishment MP and he, in what will be his last time in government, wants to be in sync with that global rebellion against the status quo."

BALANCE OF POWER

New Zealand First holds the balance of power with nine seats, a Labour-Green bloc controls 54 seats, and the National Party has 56 seats.

Labour and New Zealand First both favour curbs on trade and migration, which have both been a key source of growth for New Zealand's rapidly growing economy in recent years.

Annual net migration of 72,300 is at record levels in New Zealand, a country of just 4.7 million people, ahead of both Britain and the United States on a per capita basis.

The new government represents sweeping change for New Zealand with big implications for the currency the worlds 11th most traded the central bank, immigration and foreign investment.

Post-war migration has underpinned New Zealand's economic success, but has also become a lightning rod for nationalists such as Peters, as housing prices soar.

Peters has said he plans to obstruct the government's pro-China stance. Under the previous National government, New Zealand became the first developed country to join the China-led Asia Infrastructure Investment Bank.

Trade between the two countries has grown to more than NZ$20 billion ($14.4 billion) a year and Chinese President Xi Jinping called the relationship "unprecedented" in its depth.

After Thursday's announcement, the New Zealand dollar was last quoted 1.68 percent lower at $0.7034. It has fallen more then 4 percent against the U.S. dollar since the Sept. 23 vote. (Reporting by Ana Nicolaci da Costa and Charlotte Greenfield; Additional Reporting by Melbourne and Sydney bureaux; Editing by Michael Perry)