The tertiary sector's not losing sleep over grade inflation at universities. 

A New Zealand Initiative report's found the proportion of A-grades has increased from 22% to 35% since 2006, but academic improvement can't explain it. 

Universities NZ CEO Chris Whelan told Mike Hosking it's not clear what's causing the change, but the report only considers four factors. 

He says none include the changes in how teaching is done, the use of online technologies, and the increasing number of postgraduate students. 

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