I'm playing Sweden in 3.03 now, and it becomes a great power. Now I have a couple of countries in the sphere, Brazil, Spain, Netherlands, etc. My question is how I can get the information of the need of some good in the entire sphere. Let's say I build a few furniture factories. Now the market of my own country is saturated (this is easy to check since if there is no import of furniture, then the market is saturated). But how do I know whether the market of the sphere of influence is saturated?