That seems highly doubtful to me. First, we can't know that it maximized our collective potential and real wealth and stabilizes the world economy when one world governance doesn't exist and therefore can't be shown to have done anything yet, and second, given the economists' dismal record at predicting anything significant correctly the claim that it would or could do those things lacks credibility to me. Economists are good at post-diction, they can always explain why something happened after the fact, but given the chaotic nature of any economy--and I mean chaotic in the formal sense of chaos theory--prediction is largely beyond them.