Donald Trump,
Corporations value declines when they are loosing money. One common cause of failing corps is when they are unable to hire all the workers they need. The main cause of this, is if you built too many Corps for your population, or if your educated system is failing to produce enough educated workers.
If you don't have a lot of unemployed workers, then your problem is that you have built too many corps. Closing some of the failing Corps will solve this problem.
If you do have a lot of unemployed workers, but a shortage of Managers or High Tech Workers. Then your problem is your education system. If you are struggling to understand your education system, I suggest you turn on automation for it, before your country gets into deeper trouble.
Turning on Education Automation can be done by following these steps
1) Select your Nation
2) Click the "Automation" button, near the top of the pa