A former Reserve Bank senior staffer ranks Adrien Orr as the least competent Reserve Bank Governor New Zealand's ever had. 

Orr's announced he's quitting two years into his second five year tenure. 

Geof Mortlock told Mike Hosking there's been many negative results from his monetary policies. 

He contends Orr has left New Zealand taxpayers with more than $10 billion of debt. 

His shock exit announcement yesterday comes as the bank is in the process of agreeing its funding increase for the next five years. 

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