There's surprise among economists and industry experts after Reserve Bank Governor Adrian Orr abruptly resigned today.  

Orr was almost halfway through his second five-year term.

Former Reserve Bank economist Michael Reddell says no one's received an adequate explanation as to why Orr chose to depart today - and it's not good enough.

"Maybe he really is just exhausted - but still, you don't just walk out on the same day, on the eve of a really big conference being hosted tomorrow."

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