The Reserve Bank of Australia has published four new entries in its staff Insights series, covering non-linear Phillips curves, pandemic-era changes in price rigidity, the effect of shifts in price rigidity on inflation dynamics, and how those shifts affect optimal monetary policy. The series is presented as short analytical notes by RBA staff on economics and central banking topics, and the Bank says the papers reflect the authors’ views rather than the views of the RBA or its Boards. The four notes are grouped around inflation and labour market questions, with two also focused on modelling and one referring to COVID-19. In setting out the series, the RBA notes that the analysis may align with, extend or challenge other work undertaken at the Bank and should be understood as part of standard economic practice rather than as official policy guidance.