I'm on level 66 and still can't figure out if it's better to fill your factories full of one item (assuming of course that you have all needed supplies), or choose to make different items, especially the bakery, dairy, and sugar factories. These factories produce almost everything needed for the other factories, so how do you decide what and how much to produce? I'm continually battling to find the balance. And of course, throw in the demands of trains, planes, helping, etc. How does a helpful mayor decide? Please, need some guidance!