Gosh, that's almost incalculable.
I would call to mind Phoenix and the $2.4 billion and counting—and it still doesn't work, by the way. That was a situation that was well known to hundreds of people, almost everyone who was directly involved in the project. There was a catchphrase, “Everything going well with Phoenix”, which was ironic and was in common use, yet I believe and have evidence that the Integrity Commissioner was given credible warnings about the management of that project, and there was no investigation.
There's $2.4 billion right there.
Now, the public service spends about a billion dollars every working day. I don't know how much of that is wasted or stolen, but it's probably significant. Anyone who's a professional fraud examiner will tell you that there's corruption everywhere. All organizations experience it, and it's just simply a matter of how quickly you can find it and detect it. We have no system for detecting that.