When a central bank raises its benchmark rate, it is asking the whole economy to feel the change — borrowers and savers alike. In New Zealand this week, the major banks answered only half that call, swiftly lifting mortgage rates by the full quarter-point while offering savers a fraction of the same movement. The Reserve Bank, watching the asymmetry unfold, spoke plainly: a monetary policy signal that reaches only one side of the ledger is a signal half-sent, and an economy half-heard.