We're talking about politicians here, after all, mere mortals aswim in a sea of money. Like ducks take to a pond, we will need to provide guidance as the oceans of money they handle these days have a tendency to make even good people lose sight of whose it is.
And frankly, the Constitution doesn't deal with fiscal structure to any serious degree.
No, that has been done by those who came long after the Founding Fathers were in their graves.
FRom the creation of the Federal Reserve to the imposition of the Income Tax, these acts too, were enacted in "good faith" to serve the greater good of all of us.
The side effect, intended or otherwise, has been to enslave rather then to serve the common good.