GDI's Power is Duplication!

Do you remember the last time you saw a great movie and told your friends to go see it? If they enjoyed it too they might have told a lot of other people about it and those did maybe the same thing too.
Do you know how much money the owner of the cinema earned by you just telling your friends about this movie?
You have done this maybe a couple of times and therefore you already know how to build your income with GDI! All of those times you didn't get paid for your work but with GDI you can start earning money for yourself if you want to change your life for the better!