Quote from Banjo:
Tax Dodgers Multiply as âUnderground Economyâ Cushions Job Cuts
http://www.bloomberg.com/apps/news?pid=20601213&sid=aCuiJAVv6ZOc&refer=home
the easiest way to shut down the black market is via incentives:
1) Give whistle blowers a large % of any tax / SSI collected from reporting this
2) If you run a black market business or are employed and are a tax evader, then the Fed govt pulls your citizenship and puts you on a regular ferry that dumps you onto a barren polar island. You can duke it out with other scofflaws to get your share of the lichens that grow on the rocks...
3) Since polar bears are struggling with global warming, 500 of them are released on this evader's island. Polar bears now have plenty to eat.
Not really hard to fix...