The man at the centre of the economy for eight years has resigned, leaving without notice or explanation. 

Adrian Orr stepped down from his role as Reserve Bank governor on Wednesday. 

Senior Political Correspondent Barry Soper says it would be beneficial to hear from Orr. 

"He's either accepting absolute defeat in what he set out to do, or he's saying ... 'I've done the job, now I'm out of here.' 

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