[dottjt]

It depends where you go, especially dependent upon the town (for example, Springvale in Victoria has a large ethnic Vietnamese community, and a lot of business is done using cash)

In addition using cash often saves you money. A lot of restaurants will literally give you a discount if you pay with cash.

[jojobas]

These businesses are 100% tax-evading. There has to be a better way to balance the ability to use cash and not have people evade taxation.