even if you have a sharp regain of population PCI itself doesn't just change back to normal it grows at a limited rate per turn until it reaches where it was. Don't let your pop die when playing casher, when that happens might as well delete and wait for next set.
I wish I could find the calculator program I made for this like 20 years ago on my TI83+...
I'd love to hear from anyone who has guesses to the formulas for PCI growth.
I observed a multiple turn " adoption time " on a bulk purchase of Business tech earlier today. (I moved the needle about 8% from 132 to 140)