[pc86]

It would presumably need to be several orders of magnitude higher as I would probably buy more donuts than I would submit non-compliance reports. And let's not forget it's the government that's running this - they don't necessarily need to turn a huge (or any) profit to make this work in the long term.

  Donut with receipt:    $  1.49
  Donut without receipt: $  1.00

  Taxable reward from
  gov't for reporting
  non-compliance:        $500.00

[AnthonyMouse]

The government would also have to worry very little about profit because the fine for not giving customers receipts could be higher than the reward for reporting non-compliance, which makes the system self-funding.