Bill Stanner was a 20th century anthropologist who worked with Aboriginal people. He was also pretty racist, but let's acknowledge and move past that, and have a look at what he has to say about Aboriginal economics:

The Blacks did not fight over land. There were no wars or invasions to seize territory. They did not enslave each other. There is no class division. There is no property or income inequality.

That's communism, as Russel Ward pointed out. I'm currently studying Indigenous Knowledges and the economy that My teachers describe before colonisation is communism. But I figured you'd believe an old white guy better than Me.