Banks have a public-relations problem stemming from a deficit of trust that won't be restored by regulation but rather requires leaders to fix cultures, said the chairman of the financial system inquiry, David Murray. The financial-planning scandals at Commonwealth Bank of Australia and Macquarie Group this year raised questions about aggressive sales cultures in banks, while last week's revelations that ANZ Banking Group has suspended seven traders over possible manipulation of benchmark interest rates cast another pall over the industry.