All true. Again, I'm not advocating breaking laws. But there are limits to what the govenrment can detect and collect. Hypothetically, neighbors who informally barter labor (e.g. baby sitting for yard work) might be an example. Of course, modern economies cannot run with barter. On the other hand, there's a certain elegance in the near-impossibility of the IRS collecting tax or placing a lien on "I promised to mow Bob's lawn next month."