You know that legal truism about asking questions that you don't know the answer to?
The Vatican's assets are worth about $1 billion. It's administrative staff is smaller than the University of Notre Dame.
And they serve over 1 billion Catholics. I would call that the principle of subsidiarity in action.
That’s kind of humorous, because I do know the answer to the question.
In an interviewwith Bloomberg (which I won’t link here due to their copyright issues), in 2002, Cardinal Edmund C. Szoka, then head of financial administration, put the net assets of the Holy See at $5B.
That didn’t include the value of the real estate of Vatican City, which through ecclesiastical thimblerigging, they consider “zero.”