Corps value steadily going down? (Little Upsilon)

I just started my country 3 days ago and I have a basic grasp on the game from reading many posts and pretty much whole documentation. What I can't figure out is why the corps values that were already in the country are steadily going down, when the corps I have created are slowly going up. All hiring is at 100 percent except one and production is 100-1006 percent except for the 1.

My auto settings are: Buying is set to time based -10% of market up 8% every month not bought.

Selling: Time based +10% of market down 5% every month not sold.

Corporations in computer controlled countries cheat. They make more money than they should. In turn, this artificially inflates their market value. When you took over the country, the cheating stopped and now the value of the existing corporations is dropping to meet the true market value of the corporation.

Meanwhile, the new corporations you built are increasing in value because corporations increase in value as they produce more profit.

Don't worry too much about corporations' market value because it doesn't affect your profit...

Corporations in C3 countries cheat? How so?

They have no quality upgrades and buy quality 100 supplies but the products they produce are quality 185. With no quality upgrades and quality 100 supplies the output should also be quality 100. Exactly why this occurs is one of simcountry's unsolved mysteries...

(also note, in case it wasn't clear, that I'm talking about the C3's state corps not private corps built in a C3)

yes I noticed that when I went to trade strategies, it said that the CPU corps had quality upgrades of around 150 yet when I went to upgrade the corps myself they were all at 100... I couldn't quite figure that out.

Thanks for your help in this matter.

Keep in mind that Simcountry Corps do not expand the way that real world corporations do. Companies like general motors or Boeing try to make all of the demand. If the U.S. government orders more transport Boeing hires more workers. In simcountry each country has a fixed size work force. The stock value of Simcorps cannot continue to grow exponentially.