"The 'black economy' or 'black market' is a euphemism for the free market. (Jeff Berwick)" No, it isn't!

"They have to make it sound as bad as possible to get people to believe that by them stomping out the free market, they are helping out Australians." That's what you intend to say. Fine!

In this article the word euphemism is been mentioned by Jeff Berwick, which is in this case misapplied.
According to Google a dysphemism is a derogatory or unpleasant term used instead of a pleasant or neutral one; whereas an euphemism is a mild or indirect word or expression substituted for one considered to be too harsh or blunt when referring to something unpleasant or embarrassing.

The terms 'black economy' or 'black market' are therefore dysphemisms for 'free market'.