Via UBS:
Are the major banks setting RBA monetary policy?
The Australian monetary policy regime is shifting. Historically, the almost single driver of monetary policy settings in Australia was the RBA’s cash rate. Indeed, there used to be a very strong causality of RBA cash rate moves with borrowing rates. With 85-90% of mortgages on variable rates (and linked to short-end rates), the monetary policy transmission mechanism had an almost immediate impact on both the flow of new loan demand, as well as a cash-flow impact on existing borrowers (as banks would typically quickly ‘reprice’ the ‘back-book’).