first, you can only take over corps in a country with your ceo, not a country in your empire. if you're asking if you can take over cheaper corps with your ceo you should ask the president of the country. the way the game is now it's more of an advantage for a pres to have all ceo's anyway. you will still have to pay a penalty of at least 50b to take it over. leaving the corp in the country is usually advantageous to the country since you have to pay a fee to use resources of the country. if you decide to move the corp, that might be considered a hostile move but if the corp is doing poorly you might be doing the pres a favor by moving it. also, you'll have to pay a penalty to move it. it's important to be working with a good pres for the benefit of you both, so if you want to buy a corp, just message him/her to see if they are okay with it.