If you have iron mine nearby your steel plant, and both are located where steel is needed, it's good. When you have to move iron around, you'd calculate how mu

If you have iron mine nearby your steel plant, and both are located where steel is needed, it's good. When you have to move iron around, you'd calculate how much it costs you to move the iron vs steel, since steel would have more value. Or if would be better to produce a car and move the car...