As kptb said you gain more and more money as your level goes up. Take this for example. In my last England GC by the mid-mid late 1700's I had maxed out all my research. I owned the the province of Taiwan which game me ownership of the CoT there. This CoT was wotrh over 2000d! Now image your trader tech is level 10. You get 2000d a year from that CoT if you are the only one there (like I was at times).Actuallt I was making more than what the CoT was worth because I had IIRC 9 refineries which improves your trade income multiplier! I only monopolized CoT's that I owned (just some wierd thing I have). Having said that I did own Anglia,Alabama,Flanders,Danzig,Jakarta,Delhi,and Taiwan. If you look 4 out of the 7 are not in Europe which in my game means they are worth a whole hell of a lot more!With a .109% mutiplier.....THAT'S CASH!!!!!!