Zero probability event.
I think that Jonathan Parshall posted the best analysis of the economic issue available online here:
http://www.combinedfleet.com/economic.htm
A couple highlights
The United States had:

Nearly twice the population of Japan.
Seventeen time's Japan's national income.

Five times more steel production.

Seven times more coal production.
Eighty (80) times the automobile production.
That's BEFORE the war
Overall the United States had almost 42% of the total industrial warmaking potential of the
entire world, Japan had 2.5%