"We" audit a sample of citizens and if any of them had large non-private transactions (for example, buying a house, or investing millions in a hedge fund) we de

"We" audit a sample of citizens and if any of them had large non-private transactions (for example, buying a house, or investing millions in a hedge fund) we demand they explain where the money came from. If they don't explain it, or explain it came from a transaction which they should have disclosed, we confiscate their property or imprison them. It's hard to hide everything from the likes of the IRS.