What the depression in Australia would do to apt, page-43

Interest rate products are directly linked to the credit risk associated with the products. The fact that a mortgage is secured by a value-increasing property and a deposit, a car loan is secured by a depreciating asset and credit cards are unsecured all feed into the differences in pricing.

Banks use Risk-adjusted performance measurements such as Economic profit and Risk-adjusted Return on Capital to price their product. There is nothing predatory about it and the government won't be looking at it.

It is more likely that credit cards will seize to exist before interest rates drop because forcing a lowering of rates would just make them not economically viable.

The above isn't my "view", it's facts on how banking works. Everything is priced against risk. This feeds back to my earlier point where I noted there is a reason why you cannot compare Afterpay's merchant margins (includes taking on default risk) to those of Visa and Mastercard (don't take on default risk).