I don't really understand this question. The industrial capacity of the world is not a single thing. Factories have specific tooling in place to make specific t

I don't really understand this question. The industrial capacity of the world is not a single thing. Factories have specific tooling in place to make specific things. Even assuming the magic ability to re-tool instantly, raw materials occupy time and space and need to get to places. Even ignoring that, shutting down transport and logistics pipelines due to not wanting many workers to be congregated also slows everything down.