Peter Ryan

After days of speculation about her future, Optus chief executive Kelly Bayer Rosmarin has resigned.

Kelly Bayer Rosmarin's fate was sealed well before the mid-morning announcement from Singtel ominously titled "leadership changes at Optus".

The chairman of the Australian Securities and Investments Commission says Optus should've had a crisis plan to deal with a national outage, including how to restore 000 calls.

As the cost of living crunch gets worse for some Australians, the Reserve Bank says it's seeing evidence that businesses are passing higher inflation costs on to their customers.

Minutes from the RBA's November meeting show the central bank decided to lift interest rates to their highest level in 12 years because of alarming signs that some businesses were passing on higher inflation costs to consumers.

Alarming signs that some businesses are passing higher inflation costs on to Australian consumers convinced the Reserve Bank that another interest rate rise was needed to dampen inflation expectations.

Nearly two-thirds of organisations worry their Boards don't understand cyber challenges and are not fully prepared for a data crisis, the Goverance Institute warns. A survey of 345 executives found 57 percent are not positive about how their organisation manages and protects important data. Governance Institute CEO Megan Motto says the standout risk is cyberattacks followed by new technologies like A-I.

The Reserve Bank's new boss hasn't backed away from tough talk, warning the bank must use its 'blunt' tool of interest rate rises to tackle inflation.

Customers left without phone and internet services during this month's nationwide Optus outage are being asked to have their say as part of a review.

The latest measure of inflation, October's monthly Consumer Price Index, comes in at 4.9 per cent, down from 5.6 per cent in the 12 months to September as the impact of 13 rate hikes flows through the economy. Also Reserve Bank governor Michele Bullock says Australians are "doing fine" and coping higher mortgage repayments.