A company (corporation, lawyer, accountant, consultant, plumber, whatever) purchases a new BMW (with tax, $65,000) for $50,000 tax free as a legitimate business expense. They drive it for a year, put on maybe 5,000 miles, then sell it used to a private individual for $55,000, again tax free. All legit. All above board and documented.
The company actually profits $5,000 and the buyer saves a net $10,000 by not paying the Fair Tax.
This could be a whole new industry. Not only cars, but office computers, fax machines, copiers, furniture, TV's, coffee makers -- anything a business uses. The company may actually make more money this way that selling whatever they sell.
Of course all of those fanciful schemes are illegal and with the FairTax there is a much better chance of being detected in that sort of defalcation (more audit resources concentrating on fewer points) but - by all means - GO RIGHT AHEAD! You can both share the same jail cell with Bubba.
And a massive grey market is born!