[sheeeep86]

Not working is only part of this, many of the people are still working, just not in traditional jobs. Investing and selling drugs both need some amount of effort.

I have seen some other statistics about the hourly earnings of drug dealers, etc and the numbers were quite low for low ranking dealers.

[mbg721]

Exactly, and apart from illegal work such as drug-dealing, the article points out a "working for cash" category with the example of electricians; I'm sure there are tons of people mowing lawns, etc. The more onerous tax reporting is, the more of that there's going to be; there was a time where this would simply have been considered "working".