Sorry for the late response, just got your message.
PLEASE CORRECT ME IF I'M WRONG, THIS IS WHAT I'VE OBSERVED:
That's an odd assumption on corp values.
If they retain money, have a good, healthy stock, and lots of upgrades and a history of profit, they get high corp values.
>IPO'ing is kind'a dangerous as there are numerous dodged taxes. It happens in real life, and is kinda painful. However, if you sell 5% (check the portfolio targets as to make it 95%) then you recieve more money. How? It pays property taxes. State corps will not pay full profit, and just buy more stuff with it.
>IPO'ing can be dangerous, but if you retain a minimum 20% and it becomes enterprise, it can do a substantial amount more upgrades.
>By selling on the local market, this happens; qua 170 supplies>qua 200 upgraded corp>qua 273 supplies.
Then, you make them sell to eachother and thus qua 273 at cheap price>qua 200 upgraded corp>qua 308. Point is that you get the qua 273 at qua 120 prices, thus cheap materials.
THE FOLLOWING DETAILS ARE BASED ON A COMMON-MARKET RELIANT COUNTRY AND ENTERPRISE:
-Qua 170 of a fully upgraded state corps (upgrades to 200) turns into qua 273 artifacts.
-Qua 170 of a fully upgraded private corp(225 upgrades) turns into qua 307 upgrades.
-Qua 170 of a superupgraded(See addendum 001-A) corp(upgrades to 250) turns into the coveted qua 333 artifacts.
ADDENDUM 001-A:
If youa re an enterprise looking for risky investments, you can superupgrade.
1. Fully upgrade a private corp.
2. IPO until 20% ownership, be wary not to have it too valuable or noticeable to avoid other enterprises buying long-term shared.
3. Let it upgrade 25 more points on each, or boost for quickness.
4. Buy back all shares.
5. Upgrades will be at 250 if you did everything right and output coveted materials with cheap inputs. Namely; many of the most militaristic nations will ONLY buy weapons and ammo from said corps.