The Reserve Bank of Australia (RBA) has lifted the cash rate by 25 basis points at its latest meeting, signalling the start of a more prolonged tightening cycle. While many economists believe the RBA will need only two more rate hikes, Michael Knox argues that this view does not account for structural inflation pressures already building within the Australian economy.His modelling and economic analysis suggest the real requirement is at least four rate hikes before inflation begins to ease.