That outcome led to a substantial jump in wholesale borrowing costs in New Zealand which proved to be the death knell for banks hoping that borrowing costs would be falling soon. Margins for bank fixed rate lending have fallen tremendously in recent months and one thing banks don't like to do is cut interest rates and then have to put them right back up again.
With no chance in the near future of wholesale borrowing costs returning to where they were in June banks have increased their fixed mortgage rates by about 0.5% across all terms. Do further increases lie down the track?
Bank lending margins on fixed rate mortgages are still well below average. So, in theory it would be easy to say they will raise rates by another 0.5%. But the housing market is relatively weak and 2/3 of bank lending in New Zealand is in the form of home mortgages. So banks are reluctant to risk loss of market share in a slowly growing market.