Act says more than 10,000 professionally qualified people have left New Zealand since the election.
Party leader Richard Prebble said it had cost taxpayers $4.2 billion to train and educate them.
He called it an aid package worth over $4 billion from New Zealand to the world, particularly Australia.
"The most expensive group to educate is the 698 doctors who have migrated. A doctor costs $177,499 to educate."
Mr Prebble said 447 engineers, whose education cost $119,000 each, had also gone.
"A massive 953 scientists, whose education cost the taxpayer an average $92,000, have left since the Coalition was elected."
Deputy Prime Minister Jim Anderton, who has previously appealed to skilled New Zealanders to come home, said the trend was not new. "No one is going to be able to stop a process that has been going on for some time. If you look at those figures, they have been worsening for some time."
Mr Prebble said New Zealand achieved a net gain in professional people between 1993 and 1996, but that began to change in 1998.
"The election of the Coalition in November last year has accelerated the trend."
- NZPA
Skilled leaving, Act claims
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