Well, in a market-based economy, governments don't usually legislate rates. It's determined by the marketplace. I think some of the measures that have been discussed here, which Mr. Peters just referred to, should be helpful in that regard.
Evidence of meeting #13 for Finance in the 40th Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was banks.
A recording is available from Parliament.