If someone wants the world economy to be based on a commodity such as the metallic ore gold, then I wonder what they think would happen to the world economy, and more importantly all of the people in it, if all of a sudden, the world supply of the metallic ore gold went up by three orders of magnitude, all owned by literally one person.

Do they think people would continue to use the metallic ore gold as their currency, and they would just accept the insane inflation? And the fact that 99.9% of the world's wealth is now concentrated in the hands of one person?

Or do they think we would rapidly switch to a different commodity as our currency?

Also, why should anyone respond? Because they think the topic is interesting. I thought that would be clear. If you cannot imagine the nightmare scenario and you need "genuine writing effort" for you to imagine it, then it sounds like you don't think the topic is interesting. Maybe just let other people hash it out.