We add a simplified banking sector to the RBA's macroeconometric model (MARTIN). How this banking sector interacts with the rest of the economy chiefly depends on the extent of loan losses. During small downturns, losses are absorbed by banks' profits and the resulting effect on the broader economy is limited to that caused by the lower shareholder returns (which is already part of MARTIN). During large downturns, loan losses reduce banks' capital, and banks respond by reducing their credit supply. This reduction in supply reduces housing prices, wealth and investment; thereby amplifying the downturn (which leads to further losses). Our state-dependent approach is a significant advance on the treatment of financial sectors within existing macroeconometric models. Having a banking sector in MARTIN allows us to explore important policy questions. In this paper, we show how the effectiveness of monetary policy depends on the state of the economy. During large downturns, monetary policy is more effective than usual because it can reduce loan losses and therefore moderate any reduction in credit supply. But at low interest rates, the zero lower bound on retail deposit interest rates reduces policy effectiveness. We also investigate how one of the more pessimistic economic scenarios that could have resulted from COVID-19 might have affected the banking sector, and subsequently amplified the resulting downturn.

Inflation expectations are typically considered a pivotal and causal driver of inflation dynamics over which central banks have a strong influence. Given this influence, it is important for central banks to understand how expectations are formed and how their operations influence these expectations. We describe the various ways inflation expectations are measured and used by the Reserve Bank of Australia (RBA), and then review the evidence on how Australians form their expectations. In contrast to what is assumed in standard macroeconomic models, expectations are generally not formed rationally or with full information. We close by highlighting what these findings imply for the conduct of monetary policy.

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There is a vast international literature exploring the consequences of low interest rates for various banking sectors. In this paper, I explore how this international literature relates to the Australian banking sector, which operates differently to other jurisdictions. In the face of low rates, the profitability of Australian banks has likely been less adversely affected than what the international literature would predict, but the flip side to this is that the pass-through of monetary policy to lending rates may have been more muted. I then use a recent advance in macrofinancial modelling to explore whether pass-through in Australia could turn negative – the so called 'reversal rate' – and find that the features of the Australian banking system mean a reversal rate is highly unlikely to exist in Australia.