The next question is what are you going to building in these industrial zones in space? Let's imagine for a moment that you decided that making CPUs was just too dirty for Earth and you were going to instead build a chip fab in space.
The first question is, are you going to use existing fab technology or invent zero-g chip fab tech?
Let's imagine you go the latter route first... That's going to be a huge chunk of change... And we haven't even started to talk about the facility in space you're going to be using this fab in... Which logically means unless you're up for lots and lots of F9 and BO launches, you're backing on serious LEO heavy lift capability coming online that's not 400M per launch...
I'm not saying you can't do it... I'm just saying... you're liking starting to talk some number of billions of dollars and you haven't even got a CPU to earth yet.
Though with that all said, I've always mused that at some point we're going to run out of aritable land and our only option is going to be to start building O'Neil cylinders and growing food in space.
That's something that once you got the structure built, and you've figured out the plan/grow/harvest cycles such that different chunks of the cylinder were always in some phase you'd be shipping food back to Earth in very regular intervals.