[Wonderdonkey]

It seems to me the most unscrupulous businesses in the United States all do their business by the books. No need to fudge it by failing to declare revenue. They just don't pay taxes, and it's all legal.

Cash businesses here do exist. My mechanic only takes cash, and he's a lot cheaper (and, incidentally, better and more honest with his customers) than other mechanics I've dealt with. I wonder how the IRS deals with that. I know that with people who get tips (waiters, hairdressers, etc.) they assume a certain percentage of income from cash tips.