That's a very different circumstance though. For one thing, the majority (about 3/4) of Japans manufacturing was actually still intact, it just wasn't up to th

That's a very different circumstance though. For one thing, the majority (about 3/4) of Japans manufacturing was actually still intact, it just wasn't up to the task of keeping up with Americas war machine (which it frankly wasn't even at its peak). They also, as a key point, imported a lot during this period. That's something you can't do if everyone else has also collapsed.