The New Zealand dollar jumped to a four-month high after former US Treasury Secretary Larry Summers ruled himself out of the running to take over the top job at the Federal Reserve.
The kiwi rose as high as 82.27 US cents, trading at 81.94 cents at 12pm in Wellington from 81.34 cents at 8am and 81.24 cents on Friday in New York.
Investors dumped the greenback after Summers withdrew from the race to replace outgoing Fed chairman Ben Bernanke, as the US central bank prepares to start unwinding its massive money printing programme.
Investors saw Summers as likely to tighten monetary policy faster than his main rival, Janet Yellen.
Most currency strategists and traders expect improving US economic data will prompt the Fed to pull back its US$85 billion of monthly bond buying by a modest US$10 billion to US$15 billion following its September 17-18 meeting. Still, recent weakness in some data has raised doubts about whether the Fed will delay tapering its stimulus programme on concern it may stymie a recovery.