Joe Hockey listed nine "positive policy suggestions" on banking:1. Power for the ACCC to investigate collusive price signalling, as called for by ACCC chair Graeme Samuel.2. An APRA investigation into "whether the major banks are taking on unnecessary risks in the name of trying to maximise short-term returns." 3. Regular RBA reporting on bank net interest margins, returns on equity, and profitability "so that we can all determine whether the major banks are extracting monopolistic profits." 4. Investigating David Murray's proposal to have smaller lenders distribute loans through the Australia Post branch network.5. A Treasury and RBA investigation of ways to further improve the liquidity of the residential and commercial mortgage-backed securities markets.6. Further simplification of the Financial Services Reform Act.7. An APRA investigation into whether the risk-weightings on business loans secured by residential properties are punitive.8. Deciding whether to let banks issue covered bonds, now prohibited by APRA.9. A full review of the financial system to update the 1997 Wallis Inquiry, a proposal previously endorsed by Hockey and many others.Most of the nine suggestions are phrased as investigations, explorations or reviews, softening their impact while making them harder to oppose.The ABA disagreed outright with only the first two of the nine policy suggestions. It said rules against price signalling would lead to a one-sided public debate on banks' funding costs, and assessing risky behaviour by banks was already APRA's role. It repeated that it was "neutral" on the idea of a new financial system inquiry.Reserve Bank of Australia governor Glenn Stevens said yesterday that the RBA already reported regularly on bank margins, profits and capital, but would make no further comment on the Hockey proposals.