Supply and demand: if your price is too low you don't make money; if it's too high nobody buys. Same with what you pay for resources. Keep your prices low at first to be sure you sell your goods.
|Sit in the factory a while and watch the counters. Figure out how many resource units it takes to build a product unit, then you can tell what price range is profitable.|
YOU CANNOT SAVE YOUR GAME AT YOUR OWN FACTORY ***