Thank you very much for your helpful reply - I am not sure I understand it all! But - this situation only arose once peace happened as before I had hundreds more factories which just disappeared once peace was signed - for reasons I also don't understand
But thanks again for your efforts
I have two theories.
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My first guess is that you are fascist and had Total Mobilization economy - that would be 10% factory capacity on consumer goods.
However, even as a fascist, you can't have total mobilization without a war.
So, once peace broke out, it switched back to another economic law - probably War economy.
A fascist nation can have war economy as long as your war support is over 50.
And that means 20% for consumer goods.
So, at this point, I assume that you have LOTS of military factories/dockyards and only a few civilian factories.
As long as you had total mobilization, you could spend 10% on consumer goods and still had a few Civs left to build other stuff.
After peace broke out, the consumer goods need doubled, and now you don't have enough civilian factories for the consumer goods alone, leaving you with zero civilian factories to build stuff.
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Alternatively, you may have had control over lots of civilian factories in occupied territories, but during the peace conference, your allies grabbed all those territories with lots of civilian factories.
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Not sure how to repair this.....if you have an older save file, you might want to convert lots of military factories to civilian factories.
If there is a big neutral country out there, you might declare war on it and go back to total mobilization - but that enemy would have to have 80% of your economic power (so, no, declaring war on Ireland won't work).
However, that won't work if you actually lost CIVs in a peace deal.
Or you could delete some of your Military factories&Dockyards, thus reducing your overall economy size.
Maybe if you would upload a save game file and someone who has more experience than me could take a look at it?
Good luck,
Roland