Calls for a banking sector market study are ramping up, after the Reserve Bank asked for one earlier this week.

Bank profits have never been higher than those reported last year, it was the first time they’ve ever cracked $6 billion.

Public Policy group Monopoly Watch has set out the terms of reference it thinks the Commerce Commission could use.

Massey University Banking Associate Professor Claire Matthews told Tim Dower she isn't convinced it's a job for the Commerce Commission.

But she says there's a lot of people that think it would be a good idea and it wouldn't do any harm.

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